解方程专项练习200题(有问题详解)ok.pdf

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1、实用文档 标准文案 解方程专项练习200 题(有答案) (1)x= , (2) x =, (3)4x=, (4) 8 2.5 2x=13.6 (5) 0.78:x=3:5, (6)120%x=0.4, (8) 1 ( x)=6, (9)2xx=1.2 , (10)9 31.7x=13.4 , (11)x 25%x=24 , (12)x+0.2=, (13)0.6x+90%x=78, (14)20%x 2.4 3=0.8 , (15)xx=42, (16)0.6x+3 2.5=67.5 , (17)1 ( x0.45 )=5 , (18)x2.25=8.25 , (19):x=3:12, (20

2、)x+0.8=5.6 , 实用文档 标准文案 (21) 1.4:x=1:0.75 , (22) x( 2)=24, (23) 4x=3 , (24)12x+70.3=20.1 , (25)x+x=, (26)x: 42=, (27) 0.5+x=, (28)0.8 :=0.48 :x, (29)= , (30)42:= : (31)5x0.4=75%, ( 32) 6x0.9=4.5 , (33 )2(x3)=5.8 , (34) 1.6x=6.4, (35) 4x3 9=29, (36 )16+8x=40, (37) x 1.1=3 , (38)+2x= , (39)3 7x=1.04 ,

3、(40)x1x=2, (41)xx=14, (42)3xx=, 实用文档 标准文案 (43)=, (44)1.2 :=, (45)=:, (46):=x: 0.8 , (47)x= +1, (48)1 25%X+25%x=+25%x , (49) =, (50) X=, (51) 5 :8=x:32, (52)2x+30.9=24.9 , (53)5.3x 2.9x=, (54)( 72.8x )=1.5 , (55)x:0.3=:, (56) 150%x+66=99 (57)x+60.8x=16 (58) (59) (60)3( X) =1.3 (61) (X+0.5 ) :2 =(X 4)

4、 :, (62) X0.05=3.528 , (63)2X4 6=80, (64)44.5 3X=6.38, 实用文档 标准文案 (65)4X7.2=10 , (66)11.5X+X=20, (67)3.8 12+15X=87.6, (68)6X+5=17, (69)0.6 ( 2.5+X)=4.2 , (70):=X:, (71), (72) (73), (74)4(+x) =, (75)0.25+x=, (76)x, (77)200:6=x:, (78)4X= , (79)8(x2)=2(x+7) , (80):18%=, (81) 2x=, (82) x+ x=46, (83):x= :

5、, (84)=, (85)5(3x 4) 2(x1) =5(2x1) 实用文档 标准文案 (86)=, (87)8( 2X7) =5(X+13) , (88)3( x+4.5 ) =60, (89)1.6x+2.4=7.52, (90)3( x0.8 )=6.3 , (91)28.4 5x=5.8 , (92)x := (93)+2x=, (94)x=15% , (95)xx=, (96)x+50%x=6 , (97):x=0.3 :12, (98)4x+2(8x)=26, (99)x=0, (100)+ x=1, (101)x(+ )=, (102), (103), (104)x, (105

6、)x, (106)5x+35=650, 实用文档 标准文案 (107)7203x=80, (108)3.6x 0.9x=8.1 , (109)44.5 3x=6, (110)=, (111)631.8X=7.2 , (112)x= , (113)x=42, (114)x+=, (115)7x3=8.19 , (116)12:0.6=x :, (117)3(x+2)=4(x+1) , (118)3x 70%x=9.2, (119) 6+x=240, (120)22.5 0.4x=12.5 , (121)x:3.5=4 :2 , (122)x0.8x 6=16, (123):=x:8, (124)

7、, (125)x:15= :, (126)x+x=, (127)x50% x=5, 实用文档 标准文案 (128)1x= , (129)2.5+1x=3, (130)3x2=4, (131)8.5 3x=2, (132)3x=4, (133)x5%=17.54, (134):=: (4x) , (135) 6x+31=49, (136) 7x3=8.19 , (137) 32.89x=17.5 , (138) x0.36x=16 , (139) 67+3x=69, (140) 6x+2x56=0, (141) 3x0.45 4=2.7 , (142) 5.8x 4.6x=0.96 , (143

8、) 8.4( 9x) =3, (144) 3x1.2=8 , (145)5x+28=71, (146)8.7 1.2x=3.9 , (147)8x2.6x=37.8 , (148)0.75x 0.95 4=8.5 , (149)542+3x=72, 实用文档 标准文案 (150)8x2.6=37.8 , (151)x=, (152)x+30%x=26, (153) 7.8 3x=3.6 , (154) 63 1.8x=7.2 , (155)10:x=4.5 :0.8 , (156):=x:, (157)X7.65=4.64 , (158)28.25 X=8.25 , (159)X( 3.6+2

9、.97 )=12.42 , (160)x= , (161)14.5=5.5 , (162)x80%x=48 , (163)75%x 5=6, (164)x6.8=15.4 , (165)1.9x=5.7 , (166)4.3y y=4.6 , (167)5x+2.6=7.6 , (168) x1.5=12.9 , (169) 9x+5x=8.4, (170) 6.8+3.2x=14.8, (171)5x=, (172)x=, (173)4.5 3 x=1.5 , 实用文档 标准文案 (174) (1+25% )x=0.5 , (175)x40%x=9, (176)x20%=15.2, (178

10、)xx=, (179)x75%=3 , (180)4x, (181):x= :4.5 , (182) (x4.5 ) 6=12.5 , (183)2717x=13.4 , (184)9.6+3x=3.24 5, (185)2x+5=5x 7, (186) 3(x 2)=2 5(x2) , (187)4x3(20x)+4=0, (188)=1, (189)4x56=12, (190)8x3x=15.6 , (191)30( x4)=60, (192)7.2 0.5 3x=1.2 , (193)5x2.4 5=8, (194)+ x=2, (195)5x+2.4 15=66, (196)3.2x+

11、2.8x-x=1, 实用文档 标准文案 (197)2.5 16-8x=12 , (198)9.6-3x=6.3, (199)5(x+6)=75, (200)x0.7+0.9 3=4, 实用文档 标准文案 答案: (1)x= , =, , x=; (2) x =, x=, x21=21, x=12; (3)4x=, 4x+4x=+4x, =+4x, 4=4x4, x= (4) 8 2.5 2x=13.6 202x=13.6 , 13.6+2X=20, 2X=6.4, x=3.2; (5) 0.78:x=3:5, 3x=0.785, 3x=3.9, x=1.3 (6)120%x=0.4, 1 20

12、%x+20%x=0.4+20%x , 0.4+20%x=1, 0.4+20%x0.4=1 0.4 , 20%x=0.6, 20%x =0.6 , x=3; (8) 1( x)=6, 1( x)( x) =6( x) , 1=6( x) , 6x6=1, 6x3=1, 6x=4, 6x 6=46, x= (9)2xx=1.2 , x(2)=1.2 , x=1.2 , x=1.2 , x=1; (10)931.7x=13.4 , 271.7x=13.4 , 27 1.7x+1.7x=13.4+1.7x, 13.4+1.7x=27, 13.4+1.7x 13.4=27 13.4 , 1.7x=13.

13、6, 1.7x1.7=13.6 1.7 , x=8 (11)x25%x=24 , 75%x=24, 75%x75%=24 75% , x=32; (12)x+0.2=, x0.6=, x0.6+0.6=+0.6 , x=, x=, x=1 实用文档 标准文案 (13)0.6x+90%x=78, 1.5x=78, 1.5x1.5=78 1.5 , x=52; (14)20%x 2.4 3=0.8 , 20%x7.2=0.8 , 20%x7.2+7.2=0.8+7.2, 20%x20%=8 20% , x=40; (15)xx=42, x=42, x=42, x=252 (16)0.6x+3 2.

14、5=67.5 , 0.6x+7.5=67.5, 0.6x+7.57.5=67.5 7.5 , 0.6x=60, 0.6x 0.6=60 0.6 , x=100; (17)1 ( x0.45 )=5 , ( x0.45 )( x0.45 )=(x0.45 ) , x2.4=1.6 , x2.4+2.4=1.6+2.4, x=4, x=4, x= (18)x 2.25=8.25 , x2.25+2.25=8.25+2.25, x=10.5; (19):x=3: 12, 3x= 12, 3x3=93, x=3 (20)x+0.8=5.6 , x+0.8 0.8=5.6 0.8 , x=4.8 , x

15、=4.8 , x=8 (21) 1.4:x=1:0.75 , x=1.4 0.75 , x=1.05 (22) x( 2)=24, x=24, x=24, x=20; (23) 4x=3 , 4x+=3 + , 4x=4, 4x4=44, x=1 (24)12x+7 0.3=20.1 , 12x+2.1=20.1, 12x+2.12.1=20.1 2.1 , 12x12=1812, x=1.5; (25)x+ x=, x= , x, x=; (26)x:42=, 10x=42, 10x10=3010, x=3 实用文档 标准文案 (27) 0.5+x=, 0.75+x=3.75 , 0.75+

16、x0.75=3.75 0.75 , x=3, x=3, x=6; (28)0.8 :=0.48 :x, 0.8x=0.48 , 0.8x=0.2, 0.8x0.8=0.2 0.8 , x= (29)= , x=, x=, x=3; (30)42:= : x=42, x=30, x=50; (31)5x0.4=75%, 5x 0.4+0.4=75%+0.4 , 5x5=1.15 5, x=0.23 ( 32) 6x0.9=4.5 , 6x 0.9+0.9=4.5+0.9, 6x=5.4, 6x6=5.4 6, x=0.9; (33 )2(x3)=5.8 , 2(x3) 2=5.8 2 x3=2.

17、9 , x3+3=2.9+3 , x=5.9; (34) 1.6x=6.4, 1.6x 1.6=6.4 1.6 , x=4; (35) 4x3 9=29, 4x27=29, 4x 27+27=29+27, 4x=56, 4x4=564, x=14; (36 )16+8x=40, 16+8x16=4016, 8x=24, 8x8=24 8, x=3; (37) x 1.1=3 , x1.1 1.1=3 1.1 , x=3.3 (38)+2x= , +2x=, 2x=, 2x 2= 2, x=; (39)3 7x=1.04 , 2.167x=1.04 , 2.167x 1.04=1.04 1.04

18、 , 1.127x=0, 7x7=1.12 7, x=0.16; (40)x1x=2, x1=2, x1+1=2+1, x=3, x=3, x=18; 实用文档 标准文案 (41)xx=14, x=14, x=14, x=18; (42)3xx=, x=, x=, x=; (43)=, 2.4x=720.26 , 2.4x=18.72, 2.4x 2.4=18.72 2.4 , x=7.8; (44)1.2 :=, x=1.2 5, x=6, x=6, x=9; (45)=:, x=18, x=, x=, x=12; (46):=x: 0.8 , x=0.8 , x=0.04, x=0.2;

19、(47)x= +1, x=, x=1 (48) 1 25%X+25%x=+25%x , 0.25x+0.25 0.25=1 0.25 , 0.25x=0.75, x=3; (49) =, 0.25x=1.251.6 , 0.25x 0.25=1.25 1.6 0.25 , x=8; (50) X=, X=, x=; (51) 5 :8=x:32, 8x=532, 8x8=532 8, x=20 (52)2x+30.9=24.9 , 2x+2.7=24.9, 2x+2.72.7=24.9 2.7 , 2x2=22.2 2, x=11.1; (53)5.3x 2.9x=, 2.4x=, 2.4x2

20、.4=2.4 , x=; (54)( 72.8x )=1.5 , ( 72.8x )=1.5, 72.8x=2.1 , 72.8x+2.8x=2.1+2.8x, 72.1=2.1+2.8x2.1 , 4.92.8=2.8x 2.8 , x=1.75; (55)x:0.3=:, 实用文档 标准文案 x=0.3 , x=, x= (56) 150%x+66=99 1.5x+66=99 1.5x=33 x=22 (57)x+60.8x=16 0.2x+6=16 0.2x=10 x=50 (58) x=14.4 (59) 0.55x=5.5 x=10 (60)3( X)=1.3 3( X)( x)=1

21、.3 ( x) , 3=1.3x 0.78 , 3+0.78=1.3x 0.78+0.78 , 4.68=1.3x, 4.681.3=1.3x 1.3 , x=3.6; (61) (X+0.5) :2 =(X4) :, ( x4)=( x+0.5 ), x 4= x+ 0.5 , x10x=x+x, 2.25x10+10=0.125+10 , 2.25x2.25=10.125 2.25 , x=4.5 (62) X0.05=3.528 , X0.05 0.05=3.528 0.05 , X=0.1764; (63)2X4 6=80, 2X24=80, 2X 24+24=80+24, 2X=10

22、4, 2X2=1042, X=52; (64)44.5 3X=6.38, 183X=6.38, 183X+3X=6.38+3X, 6.38+3X=18, 6.38+3X6.38=18 6.38 , 3X=11.62, 3X3=11.62 3, X=; (65)4X7.2=10 , 4X7.2+7.2=10+7.2, 4X=17.2, 4X4=17.2 4, X=4.3; (66)11.5X+X=20, 12.5X=20, 12.5X12.5=20 12.5 , X=1.6; (67)3.8 12+15X=87.6, 45.6+15X=87.6, 45.6+15X 45.6=87.6 45.6

23、, 15X=42, 15X15=4215, X=2.8 (68)6X+5=17, 6x+5 5=175, 6x6=126, x=2; (69)0.6 ( 2.5+X) =4.2 , 0.6 ( 2.5+X ) 0.6=4.2 0.6 , 2.5+x=7, 2.5+x2.5=7 2.5 , x=4.5; (70):=X:, x= , x=, x=0.6 实用文档 标准文案 (71), , , ; (72) , , , , ; (73), , , (74)4(+x) =, +4x=, +4x=, 4x=4, x=1; (75)0.25+x=, 0.2+x=, 0.2+x 0.2=0.2 , x=,

24、 x= (76)x, , , x=; (77)200:6=x:, 6x=200, 6x6=4806, x=80 (78)4X= , 4XX= X, X=4, X=4, X=10; (79)8(x2)=2(x+7) , 8X16=2X+14, 6X16=14, 6X=30, X=5; (80):18%=, X=0.186.5 , X=1.17, X=7.8 (81) 2x=, 2x+2x=+2x, +2x= , +2x=, 实用文档 标准文案 2x=, 2x2=2, x=; (82) x+x=46, x (+ ) =46, x=46, x=46, x=40; (83):x=:, x=, x=,

25、x=, x=; (84)=, 1.6x=6.42, 1.6x=12.8, 1.6x 1.6=12.8 1.6 , x=8 (85)5( 3x4) 2(x1)=5(2x 1) 15x202x+2=10x5, 13x18=10x5, 13x1810x=10x510x, 3x18=5, 3x 18+18=5+18, 3x=13, 3x3=133, x=; (86)=, 3 (6x 1)=64, 18x3=64, 18x 3+3=64+3, 18x=67, 18x18=6718, x= (87)8(2X 7)=5( X+13) , 16x56=5x+65, 16x565x=5x+655x, 11x56

26、=65, 11x56+56=65+56, 11x=121, 11x11=12111, x=11, (88)3(x+4.5 )=60, 3 (x+4.5 ) 3=60 3, x+4.5=20, x+4.5 4.5=20 4.5 , x=15.5 (89)1.6x+2.4=7.52, 1.6x+2.42.4=7.52 2.4 , 1.6x=5.12, 1.6x1.6=5.12 1.6 , x=3.2; (90)3(x0.8 )=6.3 , 3x 2.4=6.3 , 3x2.4+2.4=6.3+2.4, 3x=8.7, 3x3=8.7 3, x=2.9; (91)28.4 5x=5.8 , 28.4

27、5x+5x=5.8+5x , 5.8+5x=28.4, 5.8+5x5.8=28.4 5.8 , 5x=22.6, 5x5=22.6 5, x=4.52 (92) x:= 25x=3, 25x=, 25x25=, x=; 实用文档 标准文案 (93)+2x=, +2x=, 2x=0, x=0; (94)x=15% , xx=15%x, 0.15x=0.15, 0.15x 0.15=0.15 0.15 , x=1; (95)xx=, x=, x=, x= (96)x+50%x=6 , 1.5x=6, 1.5x1.5=6 1.5 , x=4; (97):x=0.3 :12, 0.3x=, 0.3x

28、 0.3=9 0.3 , x=30; (98)4x+2(8x)=26, 4x+162x=26, 2x+16=26, 2x+1616=2616, 2x2=102, x=5 (99)x=0, x+=0+ , x=, x3= 3, x=; (100)+ x=1, + x=1, x=, x=, x=1; (101)x(+ )=, x=, x=, x= (102), , , 3x3=, x=; (103), , , x=20; (104)x, , , x=; (105)x, x, x= (106)5x+35=650, 实用文档 标准文案 5x+3535=65035, 5x=615, 5x5=6155,

29、x=123; (107)7203x=80, 720 3x3x=803x, 240x=720, 240x 240=720240, x=3; (108)3.6x 0.9x=8.1 , (3.6 0.9 )x=8.1 , 2.7x=8.1, 2.7x2.7=8.1 2.7 , x=3; (109)44.5 3x=6, 183x=6, 183x+3x=6+3x, 6+3x=18, 6+3x6=186, 3x=12, 3x3=123, x=4 (110)=, 2.5x=100.8 , 2.5x 2.5=8 2.5 , x=3.2; (111)631.8X=7.2 , 181.8X=7.2 , 18 1.

30、8X+1.8X=7.2+1.8X, 7.2+1.8X=18, 7.2+1.8X7.2=18 7.2 , 1.8X=10.8, 1.8X1.8=10.8 1.8 , X=6 (112)x= , x=, x=; (113)x=42, x=42, x=9; (114)x+=, x+=, x= , x=, x= (115)7x3=8.19 , 7x3 3=8.19 3, 7x=24.57, 7x 7=24.57 7, x=3.51; (116)12:0.6=x :, 0.6x=12, 0.6x=6, 0.6x0.6=6 0.6 , x=10; (117)3(x+2)=4(x+1) , 3x+6=4x+

31、4, 3x+63x=4x+43x, x+4=6, x+4 4=64, x=2 (118)3x 70%x=9.2, 3x0.7x=9.2 , 2.3x=9.2, 2.3x2.3=9.2 2.3 , x=4; (119) 6+x=240, 6+ x6=2406, x=234, x=234, x=390 (120)22.5 0.4x=12.5 , 22.50.4x+0.4x=12.5+0.4x, 12.5+0.4x=22.5, 实用文档 标准文案 12.5+0.4x12.5=22.5 12.5 , 0.4x0.4=10 0.4 , x=25; (121)x:3.5=4 :2, 2x=3.5 4, 2

32、x 2 =142 , x=6 (122)x0.8x 6=16, 0.2x6=16, 0.2x6+6=16+6, 0.2x0.2=22 0.2 , x=110; (123):=x:8, x=8, x=8, x=4; (124), 0.06x=2 0.015 , 0.06x 0.06=0.03 0.06 , x=0.5; (125)x:15=:, x=15, x6=156, x=40; (126)x+x=, x=, x=, x=; (127)x50% x=5, x=5, x6=56, x=30; (128)1x=, 1 x+x=+x, + x=1, + x=1, x=, x=; (129)2.5+

33、1x=3 , 2.5+1x2.5=32.5 , x=, x=, x= (130)3x2=4, 3x2 +2 =4+2 , 3x=6, 3x3 =6 3 , x=; (131)8.5 3x=2, 8.53x+3x=2+3x, 3x+2=8.5 , 3x+22 =8.5 2 , 3x=6, 3x3=63, x=2; (132)3x=4, 3xx=4x, 实用文档 标准文案 4x=3, 4x4=34, x= (133)x5%=17.54, 解:x5%+5%=17.54+5% , x=17.59, x=23; (134):=: (4x) , 解:4x=, 2x+x=x, 2+x, = x, x=3 (

34、135) 6x+31=49, 6x+3131=4931, 6x=18, 6x6=18 6, x=3; (136) 7x3=8.19 , 7x33=8.19 3, 7x=24.57, 7x7=24.57 7, x=3.51; (137) 32.89x=17.5 , 32.89x+9x=17.5+9x , 17.5+9x=32.8, 17.5+9x 17.5=32.8 17.5 , 9x=15.3, 9x9=15.3 9, x=1.7; (138) x0.36x=16 , (10.36 )x=16, 0.64x=16, 0.64x 0.64=16 0.64 , x=25; (139) 67+3x=

35、69, 42+3x=69, 42+3x 42=6942, 3x=27, 3x3=273, x=9; (140) 6x+2x56=0, (6+2)x56+56=0+56, 8x=56, 8x 8=568, x=7 (141) 3x0.45 4=2.7 , 3x1.8=2.7 , 3x 1.8+1.8=2.7+1.8, 3x=4.5, 3x3=4.5 3, x=1.5; (142) 5.8x 4.6x=0.96 , 1.2x=0.96, 1.2x1.2=0.96 1.2 , x=0.8; (143) 8.4( 9x) =3, 9x=8.4 3, 9x=2.8 , x=92.8 , x=6.2; (

36、144) 3x1.2=8 , 3x1.2 1.2=8 1.2 , 3x=9.6, 3x3=9.6 3, x=3.2 (145)5x+28=71, 5x+28 28=71 28, 5x=43, 5x 5=435, x=8.6; (146)8.7 1.2x=3.9 , 8.7 1.2x+1.2x 3.9=3.9+1.2x3.9 , 4.8=1.2x, 1.2x=4.8, 1.2x1.2=4.8 1.2 , x=4; (147)8x2.6x=37.8 , 5.4x=37.8, 5.4x5.4=37.8 5.4 , x=7; (148)0.75x 0.95 4=8.5 , 0.75x3.8=8.5 ,

37、 实用文档 标准文案 0.75x3.8+3.8=8.5+3.8, 0.75x=12.3, 0.75x0.75=12.3 0.75 , x=16.4, ; (149)542+3x=72, 27+3x=72, 27+3x27=7227, 3x=45, 3x3=453, x=15; (150)8x2.6=37.8 , 8x 2.6+2.6=37.8+2.6, 8x=40.4, 8x8=40.4 8, x=5.05 (151)x=, x=, x=, x4=4, x=; (152)x+30%x=26, (1+30% )x=26, 1.3x=26, 1.3x1.3=26 1.3 , x=20; (153)

38、 7.8 3x=3.6 , 7.83x+3x=3.6+3x , 3.6+3x=7.8, 3.6+3x 3.6=7.8 3.6 , 3x=4.2, 3x3=4.2 3, x=1.4 (154) 63 1.8x=7.2 , 181.8x=7.2 , 181.8x+1.8x=7.2+1.8x, 18=7.2+1.8x, 18 7.2=7.2+1.8x 7.2 , 10.8=1.8x, 10.81.8=1.8x 1.8 , x=6; (155)10:x=4.5 :0.8 , 4.5x=100.8 , 4.5x=8, 4.5x 4.5=8 4.5 , x=; (156):=x:, x=, x=, x=,

39、 x= (157)X7.65=4.64 , X7.65+8.67=4.64+7.65, X=12.29; (158)28.25 X=8.25 , 28.25X+X=8.25+X, X+8.25=28.25, X+8.25 8.25=28.25 8.25 , X=20; (159)X( 3.6+2.97 )=12.42 , X6.57=12.42 , X6.57+6.57=12.42+6.57, X=18.99 (160)x=, xx=x, x= , x=, x=, x=; (161)14.5=5.5 , 14.5+14.5=5.5+14.5, =20, 8=208, x=160 (162)x8

40、0%x=48 , 实用文档 标准文案 (10.8 )x=48, 0.2x=48, 0.2x0.2=48 0.2 , x=240; (163)75%x 5=6, 0.75x3=6, 0.75x3+3=6+3, 0.75x=9, 0.75x0.75=9 0.75 , x=12 (164)x6.8=15.4 , x6.8+6.8=15.4+6.8, x=22.2; (165)1.9x=5.7 , 1.9x 1.9=5.7 1.9 , x=3; (166)4.3y y=4.6 , 3.3y=4.6, 3.3y3.3=4.6 3.3 , y=; (167)5x+2.6=7.6 , 5x+2.6 2.6=

41、7.6 2.6 , 5x=5, 5x5=55, x=1 (168) x1.5=12.9 , x 1.5+1.5=12.91.5 , x=11.4; (169) 9x+5x=8.4, 14x=8.4, 14x14=8.4 14, x=0.6; (170) 6.8+3.2x=14.8, 6.8 6.8+3.2x=14.86.8 , 3.2x=8, 3.2x 3.2=8 3.2 , x=2.5 (171)5x=, 5xx=x, 5=x, 5=x, x=; (172)x=, x+x=+ x, = +x, = +x, = x, = =x, x=1; (173)4.5 3 x=1.5 , 1.53.5x=

42、1.5 , 1.53.5x+3.5x=1.5+3.5x, 1.5=1.5+3.5x, 1.51.5=1.5+3.5x1.5 , 0=3.5x, 03.5=3.5x 3.5 , x=0 (174) (1+25% )x=0.5 , 1.25x=0.5, 1.25x1.25=0.5 1.25 , x=0.4; (175)x40%x=9 , 0.6x=9, 0.6x0.6=9 0.6 , x=15; (176)x20%=15.2, x20% 20%=15.220% , x=76 (177)30x30=180, 30x 30+30=180+30, 30x=210, 30x30=21030, x=7; (

43、178)xx=, x=, 实用文档 标准文案 x=, x=; (179)x75%=3 , x75% 75%=3 75% , x=, x= , x= (180)4x, 4x6=2.4 , 4x=2.4+6, x=8.44, x=2.1 (181):x= :4.5 , x=4.5 , x=2, x=2, x=5 (182) (x4.5 ) 6=12.5 , 6x 4.5 6=12.5 , 6x27=12.5 , 6x27+27=12.5+27 , 6x=39.5, 6x6=39.5 6, x=6; (183)2717x=13.4 , 2717x+17x=13.4+17x , 13.4+17x=27

44、, 13.4+17x 13.4=27 13.4 , 17x=13.6, 17x17=13.6 17, x=0.8; (184)9.6+3x=3.24 5, 9.6+3x 9.6=16.2 9.6 , 3x=6.6, 3x3=6.6 3, x=2.2 (185)2x+5=5x7, 2x+5 2x=5x72x, 3x7=5, 3x7+7=5+7, 3x=12, 3x3=123, x=4; (186) 3(x 2)=2 5(x2) , 3x 6=125x, 3x6+5x=125x+5x, 8x 6=12, 8x6+6=12+6, 8x=18, 8x8=188, x=2.25; (187)4x3(20

45、x)+4=0, 7x56=0, 7x56+56=0+56, 7x=56, 7x7=567, x=8; (188)=1, () 24=124, 6(y+2) 4(2y 3)=24, 30 2y=24, 302y+2y=24+2y, 2y+24=30, 2y+24 24=30 24, 2y=6, 2y 2=62, y=3 (189)4x56=12, 4x30=12, 4x30+30=12+30, 4x=42, 4x4=424, x=10.5; (190)8x3x=15.6 , 5x=15.6, 5x5=15.6 5, x=3.12; 实用文档 标准文案 (191)30( x 4)=60, 30 (

46、 x4) 30=6030, x 4=2, x4 4=24, x=8; (192)7.2 0.5 3x=1.2 , 3.63x=1.2 , 3.63x+3x=1.2+3x , 3x+1.2=3.6, 3x+1.21.2=3.6 1.2 , 3x=2.4, 3x3=2.4 3, x=0.8 (193)5x2.4 5=8, 5x12+12=8+12, 5x=20, 5x5=20 5, x=4, (194)+x=2, x=, x=, x= (195)5x+2.4 15=66, 5x+36=66, 5x+36-36=66-36, 5x=30, 5x5=305, x=6; (196)3.2x+2.8x-x=1, 5x=1, 5x5=15, x=0.2; (197)2.5 16-8x=12 , 40-8x=12, 40-8x+8x=12+8x, 8x+12=40, 8x+12-12=40-12, 8x=28, 8x8=288, x=3.5 (198)9.6-3x=6.3, 9.6-3x+3x=6.3+3x, 6.3+3x=9.6, 6.3+3

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