复杂方程计算专项练习91题(有问题详解).pdf

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1、实用文档 文案大全 小学复杂方程专项练习91 题(有答案) (1)2x+5=5x 7, (2)3(x2)=25( x2) , (3)=1, (4)5 (X+16.81)=, (5)0.2x+=8x, (6)X+ (3X16) =10(X+1 ) , (7)x+1=x+3, (8)6(3x2) 4( 4x3) =18x, (9)4(x2)+20x 4=5( 12x) , (10)1.6 (x0.45) =5, 实用文档 文案大全 (11)35(x2) 15(5x6)=(22x63) 21(3x4) , (12)x 15+0.4=x 120.1, (13)150.54x=7-0.5x (14)x2

2、=0.25x, (15) 5X+7.25=122.5X, (16) 2(x+2) 3=3x5, (17) x+( 3x16) 25%=10(x+1) , (18)x1.4=3.6+x, (19)1.2:=, (20)=8+x, 实用文档 文案大全 (21) 8(x2) =2x+7, (22)6(x3.5)=17.8+2x, (23)5 (x+16.84)=0.2, (24) (9+ ) : ( 9 )=5:3, (25)x+(3x 16) 25%=10(x+2) , (26) (X+12 ) =42X, (27)2 (X 055) =, (28)7 (x+6) 3x=4 (2x+5) , (2

3、9)=2.5, (30)60 (x+10 )=5 实用文档 文案大全 (31)(28 2x)=6(x5) (32)64 (2x5)=32 (34)1 (x 45%)=2.8, (35)5(X+4 )=26.6 X, (36)100 0.5+(x100) 0.4=0.48x (37)3(x+2)=4( x+1) , (38)(x+2) =x+1 (39)76(x 2)=52x 32 (40)81x342=76(x2) (41)3(2x)+5(4x3)=4( x+1) 实用文档 文案大全 (42)15( 5.5x) =2x (43)16+x=12+2x+x (44)2( x4)=3(x12) (4

4、5)0.4 (4x)=1 4 (46)8( x2)=2(x+7) , (47)30%x+85=70%x+25 , (48)8.5 1.25.3x=8.5 4x (49)5x2( 32x) =16x23 (50) (x5) 59=(x12) 12 (51) (10x) 2=5x7 实用文档 文案大全 (52)2.7x1.8=1.2x+2.7 , (53)8 5(6x+0.7) =10x+0.5, (54)8.5x3.9x=55.2(x 18) , (55)122x19=(x19) 5, (56)3.5x+2=4x 1, (57)= (58)X+ (3X 16) 25%=10( X+1) (59)

5、75 (x+10 )=2, (60)5x3 (28x)=12+2x , (61)6(x+1)=0.5(10x+16) , 实用文档 文案大全 (62)5( x+2) =4(x+9) , (63)127.5 (2x+3) =15, (64)3( x+2) =4(x+1) , (65)8( x1.5)=x+0.6 , (66)7( x+6) 3x=4(2x+5 ) , (67)4x2( 5.5x)=3.5x8, (68)2.8x=19.326.4x, (69)5(y4) 7( 7y) 9=123(9y) , (70)35(x2)15 (5x6)=22x6321( 3x4) , (71)2.6x=5

6、1.63.4x, 实用文档 文案大全 (72)3( 4x2) 2(3x+3 )=98x, (73)20+4x=6x 24, (74)5( x1)=x+1, (75)3( 3x2) =10 0.5(x3.5) , (76)0.4(x0.2)+1.5=0.7x 0.38, (77) (0.6x+420) (x+20)=3, (78)35(2 x)+15(65x)=22x+7+21 (4 3x) , (79)5(3x 4) 2(x1) =5(2x1) (80)x=4.9+x, (81)3x+5 =2x+ , 实用文档 文案大全 (82)X 3.2=(18x) 5, (83)4( 4x6) =5(3x

7、+1) , (84)10X=3 (2X+17) +45, (85)5.7(X0.2)=5.1(X+0.6 )+4, (86) (3x+4)+x=7(x5) (87) (9+21)x=66x 6040440, (88)x2.5=(x1.8) 2 (89)12+( x12) +x=x (90)3(X3)+4(3X2) =7(2X) , (91)=2, 实用文档 文案大全 小学复杂方程专91 题参考答案: (1)2x+5=5x 7, 2x+52x=5x 72x, 3x7=5, 3x7+7=5+7 , 3x=12 , 3x 3=12 3, x=4; (2)3(x2)=25(x 2) , 3x6=125

8、x, 3x6+5x=12 5x+5x , 8x6=12, 8x6+6=12+6 , 8x=18 , 8x 8=18 8, x=2.25; (3)=1, () 24=1 24, 6(y+2) 4(2y3)=24, 302y=24, 302y+2y=24+2y , 2y+24=30 , 2y+2424=3024, 2y=6, 2y 2=6 2, y=3 (4)5 (X+16.81 )=, 5 ( X+16.81 ) (X+16.81 )= (X+16.81 ) , (X+16.81 )=5, (X+16.81 ) 5=5 5, X+16.81=25 , X+16.81 16.81=2516.81,

9、 x=8.19 (5)0.2x+=8x, 0.2x+x=8 x+x, 1.8x+=8, 1.8x+=8, 1.8x=7.2 , 1.8x 1.8=7.2 1.8, x=4 (6)X+ (3X 16) =10(X+1 ) , X+(3X 16) 4=10X+10 , X+12X 64=10X+10 , 13X 64=10X+10 , 13X 64+64=10X+10+64 , 13X=10X+74 , 13X 10X=10X+74 10X, 3X=74 , 3X 3=74 3, X= (7)x+1=x+3, x+1 x=x+3x, x+1=3 , x+1 1=31, x=2 (8)6( 3x2)

10、 4(4x3)=18x, 18x1216x+12=1 8x, 18x16x+8x=0 , 10x=1, x=1 10, x=; (9)4( x2)+20x4=5(1 2x) , 4x8+20x 4=510x, 24x+10x=5+12 , 34x=17, x=17 34, x=; (10)1.6 (x0.45)=5, x0.45=1.6 5, x0.45=0.32 , x=0.32+0.45 , x=0.77 ; 实用文档 文案大全 (11)35(x2) 15(5x6)=(22x63) 21(3x4) , 35x7075x+90=22x6363x+84, 35x7075x+90-22x+63x

11、=22x 63-63x+84-22x+63x x+20=21 , X+20-20 =21 20, x=1 (12)x 15+0.4=x 120.1, x+0.4=x0.1, x+0.4x=x0.1x, 0.4+0.1=x0.1+0.1 , 0.5 60=x 60, x=30; (13)150.54x=7-0.5x 150.54x+0.5x=7-0.5x+0.5x 150.53.5x=7, 150.53.5x+3.5x=7+3.5x , 150.57=7+3.5x 7, 143.5 3.5=3.5x 3.5, x=41 (14)x2=0.25x, x2+=0.25x+, x2=0.25, x2+

12、2=0.25+2, x=2, x=4 (15) 5X+7.25=122.5X, 5X+7.25+2.5X=122.5X+2.5X , 7.5X+7.25=12, 7.5X+7.25 7.25=127.25, 7.5X=5 , 7.5X 7.5=5 7.5, X= (16) 2(x+2) 3=3x5, 2x+43=3x5, 2x+1+5=3x 5+5, 2x+6=3x , 2x+62x=3x 2x, x=6 (17) x+(3x16) 25%=10 (x+1) , x+12x 64=10x+10 , 13x 64=10x+10 , 13x64 10x=10x+10 10x, 3x64+64=10

13、+64 , 3x 3=74 3, x= (18)x1.4=3.6+x, x1.4x=3.6+xx, x1.4=3.6, x1.4+1.4=3.6+1.4 , x=5 , x=5, x=60 , (19)1.2:=, x=1.2 5, x=6 , x=6, x=9 (20)=8+x , () 3=(8+x) 3, 5x2=24+3x , 5x23x=24+3x 3x, 2x2=24, 2x2+2=24+2 , 2x=26, 2x 2=26 2, x=13 (21) 8(x2)=2x+7 , 实用文档 文案大全 8x16+16=2x+7+16 , 8x=2x+23 , 8x2x=2x+23 2x,

14、 6x=23, 6x 6=23 6, x=3 (22)6(x3.5)=17.8+2x , 6x21=17.8+2x , 6x 212x=17.8+2x 2x, 4x 21+21=17.8+21 , 4x 4=38.8 4, x=9.7; (23)5 (x+16.84)=0.2, 5 ( x+16.84) (x+16.84 )=0.2 (x+16.84 ) , 5=0.2x+3.368 , 53.368=0.2x+3.368 3.368, 1.632 0.2=0.2x 0.2, x=8.16 ; (24) (9+ ) : (9 )=5:3, 3(9+X)=5(9X) , 3 9+3X=5 95X

15、 , 27+3X=45 5X, 3X+5X=45 27, 8X=18 , 8X 8=18 8, X=2.25 ; (25)x+(3x16) 25%=10 (x+2) , x+(3x16) =10x+10 2, x+(3x16) 4=10x+20 , x+3x 416 4=10x+20 , x+12x 64=10x+20 , x+12x 10x=20+64 , 3x=84, 3x 3=84 3, x=28 (26) (X+12 ) =42X, X+12 =42X, X+=42X, X+=42X, X=X, X+X=X+X , X=, X = , X=; (27)2 (X055)=, 2 (X05

16、5) (X0.55)= (X0.55) , (X0.55)=, (X0.55)=, X0.55=, X0.55+0.55=0.46875+0.55 , X=1.01875 ; (28)7 (x+6) 3x=4 (2x+5 ) , 7x+423x=8x+20 , 42+4x=8x+20 , 4x+20=42 , 4x+2020=4220, 4x=22 , 4x 4=22 4, x=5.5 ; (29)=2.5, 15=2.5 (3x+5) , 7.5x+12.5=15 , 7.5x+12.5 12.5=1512.5, 7.5x=2.5 , 7.5x 7.5=2.5 7.5, x= (30)60

17、(x+10)=5 60 (x+10) (x+10)=5 (x+10) 5x+50=60 5x+5050=6050 5x=10 5x 5=10 5 x=2 (31)(282x)=6( x5) 实用文档 文案大全 x=6x 30 +30=6x+x x= x= x=6 (32)64 (2x5)=32 64 (2x5) ( 2x5)=32 (2x5) 64x=160+64 64x=224 64x 64=224 64 x=3.5 (33)81x342=76 (x2) 81x342=76 x152 81x76x=342 152 5x=190 5x 5=190 5 x=38 (34)1 (x45%)=2.8

18、, 1.4 (x0.45)=2.8, x 0.45=1.4 2.8, x 0.45=0.5 , x0.45+0.45=0.5+0.45 , x=0.95 (35)5(X+4 )=26.6X, 5x+20+x=26 ,6x+x , 6x+2020=26.6 20, 6x 6=6.6 6, (36)100 0.5+(x 100) 0.4=0.48x 0.4x+10=0.48x 0.4x+10 0.4x=0.48x 0.4x 0.08x=10 0.08x 0.08=10 0.08 x=125 (37)3(x+2)=4(x+1 ) , 3x+6=4x+4 , 3x+63x=4x+4 3x, x+4=6

19、 , x+4 4=64, x=2 (38)(x+2)=x+1 x+=x+1 x+=x+1 x=x xx=xx x=0 x+=0+ x= x 4= 4 x=2 (39)76(x2)=52x32 76x152=52x 32 76x152+152=52x 32+152 76x=52x+120 76x52x=52x+120 52x 24x=120 24x 24=120 24 x=5 (40)81x342=76 (x2) 81x342=76x 152, 81x342+342=76x 152+342, 81x=76x+190 81x76x=76x+190 76x 5x=190 5x 5=190 5 x=3

20、8 (41)3(2x)+5( 4x3)=4(x+1) 63x+20x 15=4x+4 17x9=4x+4 17x4x+99=4x 4x+4+9 13x=13 13x 13=13 13 x=1 ; (42)15( 5.5x)=2x 155.5+x=2x 2xx=9.5 x=9.5 ; (43)16+x=12+2x+x 实用文档 文案大全 16+x=12+3x 3xx=16 12 2x=4 x 2=4 2 x=2 (44)2(x4) =3(x12) 2x8=3x36 2x82x=3x 2x36 8=x36 8+36=x 36+36 x=28 ; (45)0.4 (4x)=1 4 = 1.6=4x

21、1.6+x=4 x+x 1.6+x=4 1.6+x 1.6=41.6 x=2.4; (46)8(x2) =2(x+7) , 8x16=2x+14 , 8x162x=2x+14 2x, 6x16+16=14+16 , 6x 6=30 6, x=5 (47)30%x+85=70%x+25 , 0.3x+85 0.3x=0.7x+25 0.3x, 0.4x+25=85 , 0.4x+25 25=8525, 0.4x=60 , 0.4x 0.4=60 0.4, x=150; (48)8.5 1.25.3x=8.5 4x 10.25.3x=8.5 4x 10.25.3x+5.3x 8.5=8.54x+5

22、.3x 8.5 1.3x=1.7 1.3x 1.3=1.7 1.3 x= (49)5x2(32x)=16x 23 5x6+4x=16x 23 9x 6=16x23 9x69x+23=16x 239x+23 7x=17 7x 7=17 7 x= (50) (x5) 59=(x12) 12 5x259=12x 144 5x34=12x144 5x345x+144=12x 144 5x+144 7x=110 7x 7=110 7 x= (51) (10x) 2=5x 7 10x=10x 14 10x+x+14=10x 14+x+14 11x=24 11x 11=24 11 x= (52)2.7x1.

23、8=1.2x+2.7 , 2.7x1.8+1.8=1.2x+2.7+1.8 , 2.7x1.2x=1.2x+4.5 1.2x, 1.5x 1.5=4.5 1.5, x=3 ; (53)85(6x+0.7)=10x+0.5 , 830x3.5=10x+0.5 , 4.530x+30x=10x+0.5+30x, 4.50.5=40x0.5, 4 40=40x 40, x=0.1; (54)8.5x3.9x=55.2 (x18) , 4.6x=55.2x 993.6, 4.6x4.6x=55.2x 993.64.6x, 50.6x993.6=0 , 50.6x993.6+993.6=993.6 ,

24、50.6x=993.6 , 50.6x 50.6=993.6 50.6, x=19.; (55)122x19=(x19) 5, 103x=5x 95, 103x+x=5x 95+x, 103+95=6x 95+95, 198 6=6x 6, x=33; (56)3.5x+2=4x 1, 实用文档 文案大全 3.5x+2 3.5x=4x13.5x, 2+1=0.5x 1+1, 3 0.5=0.5x 0.5, x=6 (57)= 3.5(X16)=1.5X , 3.5X 56=1.5X 3.5X56+56=1.5X+56 3.5X 1.5X=56 2X=56 X=28 , (58)X+(3X 16

25、) 25%=10 (X+1 ) X+ (3X 16) 4=10X+10 X+3X 416 4=10X+10 13X 64=10X+10 13X64+64=10X+10+64 13X=10X+74 13X 10X=10X+74 10X 3X=74 X= (59)75 (x+10)=2, 75 (x+10) (x+10)=2 (x+10 ) , 2x+20=75 , 2x+20 20=7520, 2x=55, 2x 2=55 2, x=27.5; ; (60)5x3 (28 x)=12+2x , 8x 84=12+2x , 8x84+84=12+2x+84 , 8x=96+2x , 8x 2x=9

26、6+2x 2x, 6x=96, 6x 6=96 6, x=16 (61)6(x+1)=0.5(10x+16 ) , 6x+6=5x+8 , 6x+66=5x+8 6, 6x5x=5x+2 5x, x=2 (62)5(x+2)=4(x+9 ) , 5x+10=4x+36 , 5x4x=36 10, x=26; (63)127.5 (2x+3 )=15, 127.5 (2x+3) (2x+3)=15 (2x+3) , 15 (2x+3)=127.5, 15 (2x+3) 15=127.5 15, 2x+3=8.5 , 2x+33=8.53, 2x=5.5, 2x 2=5.5 2, x=2.75;

27、(64)3(x+2)=4(x+1) , 3x+6=4x+4 , 3x+63x=4x+4 3x, x+4=6 , x+44=6 4, x=2; (65)8(x1.5)=x+0.6 , 8x12=x+0.6 , 8x12+12=x+0.6+12 , 8x=x+12.6 , 8xx=x+12.6 x, 7x=12.6 , 7x 7=12.6 7, x=1.8; (66)7(x+6) 3x=4(2x+5 ) , 7x+423x=8x+20 , 4x+42=8x+20 , 4x+424x=8x+20 4x, 4x+20=42 , 4x+2020=4220, 4x=22, 4x 4=22 4, x=5.5

28、; (67)4x2(5.5x)=3.5x8, 4x11+2x=3.5x 8, 6x11=3.5x8, 6x11+11=3.5x 8+11, 3.5x+3=6x , 3.5x+33.5x=6x 3.5x, 2.5x=3, 2.5x 2.5=3 2.5, x=1.2 实用文档 文案大全 (68)2.8x=19.32 6.4x, 2.8x+6.4x=19.32 6.4x+6.4x , 9.2x=19.32 , 9.2x 9.2=19.32 9.2, x=2.1; (69)5(y4) 7(7y) 9=123(9y) , 5y 2049+7y9=1227+3y , 12y78=3y15, 12y78+7

29、8=3y 15+78, 12y3y=3y+63 3y, 9y=63, 9y 9=63 9, y=7 (70)35(x2) 15(5x 6)=22x 6321(3x4) , 35x7075x+90=22x 6363x+84 , 35x75x22x+63x= 63+8490+70, x=1 (71)2.6x=51.6 3.4x, 2.6x+3.4x=51.6 3.4x+3.4x , 6x=51.6 , 6x 6=51.6 6, x=8.6; (72)3(4x2) 2(3x+3)=98x, 6x12=98x, 6x12+8x=9 8x+8x , 14x12=9, 14x12+12=9+12 , 14

30、x=21 , 14x 14=21 14, x=1.5; (73)20+4x=6x 24, 20+4x4x=6x 244x, 2x24=20, 2x24+24=20+24 , 2x=44, 2x 2=44 2, x=22 ; (74)5(x1) =x+1 , 5x5=x+1 , 5x5x=x+1 x, 4x5=1, 4x5+5=1+5 , 4x=6, 4x 4=6 4, x=1.5; (75)3(3x2)=100.5(x3.5) , 9x6=11.750.5x, 9x 6+0.5x=11.75 0.5x+0.5x , 9.5x6=11.75, 9.5x6+6=11.75+6 , 9.5x=17.

31、75 , 9.5x 9.5=17.75 9.5, x=; (76)0.4(x0.2)+1.5=0.7x 0.38, 0.4x+1.42=0.7x 0.38, 0.4x+1.42 0.4x=0.7x 0.380.4x, 0.3x0.38=1.42 , 0.3x0.38+0.38=1.42+0.38 , 0.3x=1.8 , 0.3x 0.3=1.8 0.3, x=6; (77) (0.6x+420 ) (x+20)=3, (0.6x+420 ) (x+20) (x+20)=3 (x+20 ) , 3(x+20)=0.6x+420 , 3x+60=0.6x+420 , 3x+600.6x=0.6x

32、+420 0.6x, 2.4x+60=420 , 2.4x+6060=420 60, 2.4x=360 , 2.4x 2.4=360 2.4, x=150; (78)35(2x)+15(65x)=22x+7+21 (43x) , 160110x=91 41x, 160110x+110x=91 41x+110x , 69x+91=160 , 69x+91 91=16091, 69x=69, 69x 69=69 69, x=1 (79)5(3x4) 2( x1)=5(2x1) 15x202x+2=10x 5, 13x18=10x 5, 13x1810x=10x 510x, 3x18=5, 3x18

33、+18= 5+18, 3x=13, 实用文档 文案大全 3x 3=13 3, x=; (80)x=4.9+x, xx=4.9+xx, x=4.9, x=4.9, x=10.5; (81)3x+5 =2x+ , 3x+=2x+, 3x+=2x+, 3x=2x , 3x2x=2x 2x, x=0 ; (82)X 3.2=(18x) 5, X 3.2=( 18x) , X 3.2 3.2=(18x) 0.2 3.2, X=11.52 0.64X, X+0.64X=11.52 0.64X+0.64X , 1.64X=11.52 , 1.64X 1.64=11.52 1.64, X=7; (83)4(4

34、x6)=5(3x+1 ) , 16x24=15x+5 , 16x2415x=15x+5 15x, x24+24=5+24 , x=29 (84)10X=3 (2X+17 )+45, 10X=6X+51+45 , 10X=6X+96 , 10X6X=6X+96 6X, 4X 4=96 4, X=24 ; (85)5.7(X0.2)=5.1( X+0.6 )+4, 5.7X 1.14=5.1X+3.06+4 , 5.7X 1.14=5.1X+7.06 , 5.7X1.145.1X=5.1X+7.06 5.1X, 0.6X1.14+1.14=7.06+1.14 , 0.6X 0.6=8.2 0.6,

35、 X=13 (86) (3x+4)+x=7 (x5) 4x+4=7x 35 4x+44x=7x 354x 3x35=4 3x35+35=4+35 3x=39 3x 3=39 3 x=13 (87) (9+21)x=66x 6040440, 30x=1.1x 480, 30x1.1x=1.1x 4801.1x, 28.9x 28.9=480 28.9, x= 16 (88)x2.5=(x1.8) 2 x2.5=2x3.6 x2.5x+3.6=2x 3.6x+3.6 x=1.1 (89)12+(x12) +x=x 12+0.2x 2.4+0.5x=x 0.7x+9.6=x x0.7x=9.6 0.3x=9.6 x=32 (90) 3(X3)+4(3X2)=7(2X) , 3X 9+12X 8=147X , 15X 17=147X , 15X17+7X=14 7X+7X , 22X 17+17=14+17 , 22X 22=31 22, X=1; (91)=2, 18X126X 9=6X+4 24, 12X 21=6X 20, 12X 21+21=6X 20+21, 12X 6X=6X+1 6X , 实用文档 文案大全 6X 6=1 6, X=

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