六年级分数方程专项练习180(附答案).pdf

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1、第 1 页 共 33 页 分数方程专项练习180 题(有答案) (1)+X=, (2)X=, (3)x+x=42 , (4)=, (5)5x 3=, (6)x+=, (7)+2x=, (8)12 (x+)=1.2, (9) (10) 第 2 页 共 33 页 (11)X 2=4 5, , (12)XX=, (13)90 +x=20, (14)0.2x+=8x, (15)X+(3X16) =10( X+1) , (15)=, (16)XX=1, (17)x+x=42 (18), (19)=1, (20)2X+1=2, (21)x= 第 3 页 共 33 页 (22)x+2=4.25 (23)x(

2、 1 +)=4.5 (24)37.5+x=69 (25), (26)x=2.4 5, (27)x+=, (28)x+x=121, (29) (x+) 7=8.1, (30)=, (31)4x+=5, (32)+x=9, (33)xx=, 第 4 页 共 33 页 (34)x+x=11, (35)2x+=4.625, (36)2X=, (37)xx=2, (38)+21.5=x, (39)3x=, (40)+x=, (41)x+5 4=95 (42)xx= (43) 3 =, (44)xx=0.2, (45) y4y=18, 第 5 页 共 33 页 (45), (46) 3+2.75x=, (

3、47), (48)5x3=, (49)x=, (50)x+x=39, (51)7x3x=, (52)x+=, (53)=, (54), (54), (55)5x=34 第 6 页 共 33 页 (56)x 6= (57)x+1.2x=25 (58)8 4.5x=, (59)x0.95 4=8.5, (60)2x=2+, (61)x+x=, (62)x=2, (63)=2.5, (64)x=18, (65)x=, (66)xx=, (67), 第 7 页 共 33 页 (68), (69)xx=, (70)1.25:0.25=, (71)1x=, (72)x+x=, (73)x+x=42, (7

4、4)x+0.25=, (75)x=10 , (76)x+x=2, (77)x (137.5%)=, (78)( x+)=2, (79)x=50, 第 8 页 共 33 页 (80)x+x=42, (81)4+x=102, (82)X+X=, (83)X=, (84) (1)X=, (85) =, (86) =42 , (87)8x 3=, (88)+=1, (89)3x =50%, (90)3xx=, (91)+x=, 第 9 页 共 33 页 (92)x=, (93) x=0.8, (94)x+5 4=95, (95)xx4=18, (96) =, (97)x =4, (98)=, (99)

5、 6=7, (100)+5x=110, (101)x4=60, (102)xx=9, (103)xx=3.6, 第 10 页 共 33 页 (104) x= (105)=9.1, (106)4(+x)=, (107) 0.25+x=, (108)x+x=, (109), (110), (111)+3x=, (112)=, (113) X=, (114)x =30, (115)x=7, 第 11 页 共 33 页 (116)x= 10, (117)XX=6, (118)X2=13, (119) (1) X=480 , (120)6X+X=39 , (121)2.4=3.2x, (122), (1

6、23), (124)XX=, (125)6X+4.5=, (126)80%X0.6=4.2, (127)X+X=, 第 12 页 共 33 页 (128)X+X=, (129) x=, (130)x=42, (131)x+=, (132)X=, (133)X+X=3, (134)X+= 8, (134), (135), (136)x7.5=, (137)2X+=1, (138)X =, 第 13 页 共 33 页 (139)XX=1.5 , (140)x=28, (141) (x+3) =48, (142)x=, (143), (144)2 x=2, (145)34x=2, (146)x= (

7、147) x= (148)X25%X=135 , (149)X12.5 4=0, (150)x+ =1, 第 14 页 共 33 页 (151)x ()=, (152)8 1.5x=1.1, (153)xx=2, (154)x=, (155)xx=15, (156)X =, (157)(X)=, (158)X+X= , (159)x=, (160)x+0.75=0.15, (161)2x+=4.625, (162) 4.8x=15.8, 第 15 页 共 33 页 (163)x=14, (164)x+x=2.1, (165)2.7 120%x=9 , (166) (13X) =6, (167)

8、x 21 =4 (168)1x+x= (168)x ()= (169)2+x=5, (170)4x=; (171)x = (172)xx=3 (173)6x3.5x= 第 16 页 共 33 页 (174)3X= (175) (176)5X3 (177)x =5 (178) =, (179) + =, (180)x= (181)x+15=40 (182)x = 专项练习参考答案: (1)+X=, +X =, X=; 第 17 页 共 33 页 (2)X=, X+=+, X=; (3)x+x=42 , (+)x=42 , x=42, x =42 , x=36; (4)=, 4.5x=8, 4.5

9、x 4.5=8 4.5, x= (5)5x 3=, 5x, 5x, 5x 5=, x=0.7 (6)x+=, x+=, x=, x = , x=; (7)+2x=, +2x=, 2x 2= 2, x=; (8)12 (x+)=1.2, 12 (x+) (x+)=1.2 (x+) , 1.2 (x+) =12, 1.2 ( x+) 1.2=12 1.2, x+=10, x=9 (9) x=, x=4, x=; (10) , 3x+=+, , 3x 3= 3, (11)X 2=4 5, , X=20 , X =20 , X=15 (12)XX=, (1)X=, X=, X 3= 3, X= 第 1

10、8 页 共 33 页 (13)90 +x=20, 15+x=20, 15+x15=20 15, x 2=5 2, x=10; (14)0.2x+=8x, 0.2x+x=8x+x, 1.8x+=8, 1.8x+=8, 1.8x=7.2, 1.8x 1.8=7.2 1.8, x=4 (15)X+(3X16) =10( X+1) , X+ (3X16) 4=10X+10 , X+12X 64=10X+10 , 13X64=10X+10 , 13X 64+64=10X+10+64 , 13X=10X+74 , 13X10X=10X+74 10X, 3X=74, 3X 3=74 3, X= (15)=,

11、 +2x=+2x, +2x=, +2x=, 2x=1, 2x 2=1 2, x=0.5 (16)XX=1, ()X=1, X=1, X 2=1 2, X=2; (17)x+x=42 (+)x=42 x=42 x=42 x=36 (18), =, =, =, =, =, x= (19)=1, () 6=1 6, 4x+23x+3=6, x+5=6 , x+55=65, x=1 (20)2X+1=2, 2X+1=2, 2X 2= 2, X= (21)x= x= 第 19 页 共 33 页 x= x=; (22)x+2=4.25 x=4.252 x=4 2 x=3 2 x=1; (23)x( 1 +

12、)=4.5 x( 1 +) =4.5 x1=4.5 x=4.5+1 x=4+1 x=4+1 x=6; (24)37.5+x=69 37.5+0.2+x=69.5 37.7+x=69.5 x=69.537.7 x=31.8 (25), , , , x=18 (26)x=2.4 5, x 6=12 6, x=72 ; (27)x+=, x=, x=, x= (28)x+x=121, x=121, , x=132; (29) (x+) 7=8.1, 7x+6=8.1, 7x+66=8.16, 7x 7=2.1 7, x=0.3; (30)=, 3.6= 3.6, x=15 (31)4x+=5, 4x

13、+=5, 4x 4=, x=; (32)+x=9, +x=9, x=; (33)xx=, 第 20 页 共 33 页 x=, x 6= 6, x=5; (34)x+x=11, x=11, x=11, x= (35)2x+=4.625, 2x+=4.625, 2x=4, x=2, (36)2X=, 2x+2x=+2x, =2x, 2x=, x=, (37)xx=2, x=2, x =2 , x=; (38)+21.5=x, 22=x, 22 =x x= (39)3x=, 1448x=11, 48x+11=14, 48x+11 11=1411, 48x=3, 48x 48=3 48, x=; (4

14、0)+x=, 3x+1=2, 3x+1 1=21, 3x=1 , 3x 3=1 3, x=; (41)x+5 4=95 x+20=95 x=9520 x=75 x=75 x=125 (42)xx=, x=, x=, x=; (43) 3 =, 3 +3x=+3x, 3x+=, 3x+=, 3x=, 3x 3= 3, x= (44)xx=0.2, 第 21 页 共 33 页 ()x=0.2, x=0.2, x=8.4; (45)y4y=18, y4=18, y4+4=18+4 , y=22, y=88 (45), x= , x=; (46) 3+2.75x=, +2.75x=, +2.75x=,

15、 2.75x=, 2.75x 2.75= 2.75, x=; (47), 5x=4.8, 5x 5=4.8 5, x=0.96; (48)5x3=, 5x=, 5x+=+, 5x=, 5x 5= 5, x= (49)x=, x = , x=1.5; (50)x+x=39, x=39, x=39, x=24 ; (51)7x3x=, 4x=, 4x 4= 4, x= (52)x+=, x+=, =, x=; (53)=, () x=, x=, x=, x= (54), 0.9+x=3.2 x+x, 0.9+x0.9=3.20.9, x=2.3; (54), 第 22 页 共 33 页 4.5+2

16、.75x4.5= 4.5, 2.75x=1, 2.75x 2.75=12.75, x= (55)5x=34 5x+=34+ 5x=34 5x 5=34 5 x=6.95; (56)x 6= x 4.8= x4.8+4.8=+4.8 x=5.55 x=5.55 x=18.5 (57)x+1.2x=25 (+1.2)x=25, 5x=25, 5x 5=25 5, x=5; (58)8 4.5x=, 84.5x+4.5x=+4.5x, +4.5x=8 , +4.5x=8, 4.5x=4.5 , 4.5x 4.5=4.5 4.5, x=1; (59)x0.95 4=8.5, x3.8=8.5, x 3

17、.8+3.8=8.5+3.8, x=12.3, x =12.3 , x=16.4; (60)2x=2+, (2x) 2=(2+) 2, 4x x1=4+x+1 , 3x1=x+5 , 3x 1+1=x+5+1 , 3x=x+6 , 3xx=x+6 x, 2x=6, 2x 2=6 2, x=3 (61)x+x=, x=; (62)x=2, xx+=2x, x+=x, x+x=x+x, x=, x=, x=, x=1 (63)=2.5, () 12=2.5 12, 4x+8 3x+9=30, x+17=30, 第 23 页 共 33 页 x+17 17=30 17, x=13 (64)x=18,

18、x =18 , x=27; (65)x=, x+=+, x=, x = , x=; (66)xx=, x=, x = , x= (67), , x=1; (68), x=, x+=+, x=2 (69)xx=, x=, x = , x=; (70)1.25:0.25=, 0.25x=1.25 1.6, 0.25x=2, 0.25x 0.25=2 0.25, x=8; (71)1x=, 1x+x=+x, x+=1, x+=1, x=, x = , x=; (72)x+x=, x=, x = , x= (73)x+x=42, (+)x=42, x=42, x =42 , x=36 ; (74)x+

19、0.25=, x+0.25=0.25, x+0.25 0.25=0.250.25, x=0; (75)x=10 , x 3= 3, 第 24 页 共 33 页 x=; (76)x+x=2, (+)x=2, x=2, x = , x=; (77)x (137.5%)=, 0.625x=, x=, x = , x=1; (78)(x+)=2, x+ =2, x+=, x+=, x=, x 4= 4, x=; (79)x=50, x=15, x 5=15 5, x=75; (80)x+x=42, (+)x=42, x=42, x =42 , x=36; (81)4+x=102, 4+x4=1024,

20、 x=98, x 5=98 5, x=490; (82)X+X=, x=, x=; (83)X=, X+x=+x, =+x, x=; (84) (1)X=, x=, x=1 (85) =, =, = , =3; (86) =42 , =42 , 第 25 页 共 33 页 =42 , =50; (87)8x 3=, 8x=, 8x+=+, 8x=12, 8x 8=12 8, x=1.5 (88)+=1, x+2=4, x+22=42, x=2; (89)3x =50%, 3x=, 3x+=+, 3x=, 3x 3= 3, x= (90)3xx=, x=, x = , x= (91)+x=, +

21、x=, x=; (92)x=, x+x=+x, =+x, x= (93) x=0.8, x x= x, x=, x=, x = , x=, x=; (94)x+5 4=95, x+20=95 , x+20 20=95 20, x=75, x =75 , x=75 , x=125; (95)xx4=18, (1)x4+4=184, x=14, x 4=14 4, x=56 (96) =, x x= x, x=, x 2= 2, 第 26 页 共 33 页 x=; (97)x =4, x =4 , x=5; (98)=, = , x=3; (99)6=7, 6+6=7+6, =13, 2=13 2

22、, x=26 (100)+5x=110, x+10x=220 , 11x=220, 11x 11=220 11, x=20 ; (101)x4=60, x4+4=60+4 , x=64, x=192; (102)xx=9, x=9, x=9, x=30; (103)xx=3.6, x=3.6, x =3.6, x=4.8; (104) x= x x= x, =x, x=4; (105)=9.1, 7=9.1 7, x=63.7; (106)4(+x)=, +4x=, +4x=, 4x=4 , x=1; (107) 0.25+x=, 0.2+x=, 0.2+x0.2=0.2, x=, x= (1

23、08)x+x=, x=, x, x=; (109), , 第 27 页 共 33 页 , x=; (110), , , x=90; (111)+3x=, +3x=, 3x=, 3x 3= 3, x=; (112)=, 4x=3 1.2, 4x=3.6, 4x 4=3.6 4, x=0.9 (113) X=, X=, X+X=+X, +X=, +X=, X=0 (114)x =30, x =30 , x=25; (115)x=7, () x=7, x=7, x=7, x=20; (116)x= 10, x=8, x=8, x=11; (117)XX=6, X=6 , X =6 , X=15 ;

24、(118)X2=13, X2+2=13+2 , X=15 , X =15 , X=40 (119) (1)X=480 , X=480 , X =480 , X=540 ; (120)6X+X=39 , 6.5X=39 , 6.5X 6.5=39 6.5, X=6 (121)2.4=3.2x, 0.9=3.2x, 0.9+x=3.2x+x , 第 28 页 共 33 页 0.9+x=3.2 0.9+x0.9=3.20.9, x=2.3; (122), x=7, x=7, x=; (123), +2.75x=, +2.75x=, 2.75x=, 2.75x 2.75= 2.75, x= (124)

25、XX=, X=, X = , X=; (125)6X+4.5=, 6X+4.5 4.5=4.5, 6X=2 , 6X 6=2 6, X= (126)80%X 0.6=4.2, 0.8X 0.6+0.6=4.2+0.6, 0.8X=4.8 , 0.8X 0.8=4.8 0.8, X=6; (127)X+X=, X=, X=, X= (128)X+X=, X=, X=, X= (129) x=, x= , x=; (130)x=42, x=42, x=9; (131)x+=, x+=, x=, x = , x= (132)X=, X=, X=1, x=1; (133)X+X=3, x=3, 第 2

26、9 页 共 33 页 x=3, x=3; (134)X+= 8, X+=4, X=3, X=3, x=4 (134), 3x6+6=8.25+6, 3x=15, 3x 3=15 3, x=5; (135), (+)x=15, x =15 , x=12 (136)x7.5=, x7.5+7.5=+7.5, x=13.75, x=13.75, x=2.75 (137)2X+=1, 2X+=1, 2x=, 2x 2= 2, x=; (138)X =, X = , x=; (139)XX=1.5 , ()X=1.5 , X=1.5 , X 6=1.5 6, X=9; (140)x=28, x=32;

27、(141) (x+3) =48, 0.5x+1.5=48, 0.5x+1.51.5=481.5, 0.5x=46.5, 0.5x 2=46.5 2, x=93; (142)x=, x=, x =, x=, x=0.5; (143), 5x=3.2 8, 5x=25.6, 5x 5=25.6 5, x=5.12 (144)2 x=2, 2 x x=2 x, 22=2x 2, x=1; 第 30 页 共 33 页 (145)34x=2, 3 4x+4x=2+4x, 3 2=2+4x 2 , 1=4x , 1 4=4x 4, x=0.25; (146)x= x=, x=, x=, x=; (147)

28、 x= x=, x=, x= , x=1 (148)X25%X=135 , 0.75X=135 , 0.75X 0.75=135 0.75, X=180 ; (149)X12.5 4=0, X50=0, X50+50=0+50 , X=50, X =50 , X=250 (150)x+ =1, x+=1, x+, x, x=; (151)x () =, x=, x 12= 12, x=8 (152)8 1.5x=1.1, 21.5x=1.1, 21.1+1.5x 1.5x=1.11.1+1.5x, 1.5x=0.9, 1.5x 1.5=0.9 1.5, x=0.6; (153)xx=2, x=

29、2, x 2=2 2, x=4 (154)x=, x=, , x=; (155)xx=15, , , x=24 第 31 页 共 33 页 (156)X =, X = , x=; (157)(X)=, (X)=, x, x=; (158)X+X= , x=, x, x= (159)x=, x+x=+x, +x=, +x=, x=; (160)x+0.75=0.15, x+0.75+=0.15+, x+0.75=0.75, x+0.750.75=0.750.75, x=0; (161)2x+=4.625, 2x+=4.625, 2x=4, 2x 2=4 2, x=2 (162) 4.8x=15.

30、8, 4.8x 4.8x=15.8 4.8x, 75.84x=, 75.84x 75.84= 75.84, x=; (163)x=14, x=14 , x=14, x=12 (164)x+x=2.1, x=2.1, x =2.1 , x=1.2; (165)2.7 120%x=9 , 2.7 1.2x 1.2x=9 1.2x, 2.7=10.8x, 2.7 10.8=10.8x 10.8, x=0.25; (166) (13X) =6, (13X) =6 , 13X+X=8+X , 138=8+X 8, X=5 (167)x21 =4 x 14=4 x14+14=4+14 x=18 x=60

31、(168)1x+x= x= 第 32 页 共 33 页 x= x= (168)x ()= x= x= x=8 (169)2+x=5, 22+x=52, x=52, x=2; (170)4x=; 4x+=+; 4x=1, 4x 4=1 4, x= (171)x = x = x= (172)xx=3 x=3 x =3 x=8 (173)6x3.5x= 2.5x= 2.5x=0.75 2.5x 2.5=0.75 2.5 x=0.3 (174)3X= 3X+3X=+3X =+3X =+3X =3X 3=3X 3 X=; (175) x= x = x=; (176)5X 3 5X2.1= 5X2.1+2.1=+2.1 5X=3.5 5X 5=3.5 5 X=0.7; (177)x =5 x=5 x=5 x=25 (178) =, =, x=; (179) + =, x=, 第 33 页 共 33 页 x=, x= (180)x= x= x=1.8; (181)x+15=40 x+1515=4015 x=25 x =25 x=35; (182)x = x = x=

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