复杂方程计算专项练习91题(有答案).docx

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1、.小学复杂方程专项练习91题(有答案);.(1)2x+5=5x7, (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)+20x4=5(12x), (10)1.6÷(x0.45)=5, (11)35(x2)15(5x6)=(22x63)21(3x4), (12)x÷15+0.4=x÷120.1, (13) 150.54x=7-0.5x (14) x2=0.25x,

2、(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,(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+(3x16)÷25%=10(x+2), (26)(X+12)×=42X,(27)2÷(X055)=,(28)7×(x+6)3x=4×(2x+5),(29)=2.

3、5, (30) 60÷(x+10)=5 (31) (282x)=6(x5) (32) 64÷(2x5)=32 (34)1÷(x45%)=2.8, (35)5(X+4)=26.6X,(36)100×0.5+(x100)×0.4=0.48x (37)3(x+2)=4(x+1), (38)(x+2)=x+1(39)76(x2)=52x32 (40)81x342=76(x2) (41)3(2x)+5(4x3)=4(x+1)(42)15(5.5x)=2x (43)16+x=12+2x+x (44)2(x4)=3(x12) (45)0.4÷(4x

4、)=1÷4 (46)8(x2)=2(x+7), (47)30%x+85=70%x+25, (48)8.5×1.25.3x=8.54x (49)5x2(32x)=16x23 (50)(x5)×59=(x12)×12 (51)(10x)÷2=5x7(52)2.7x1.8=1.2x+2.7,(53)85(6x+0.7)=10x+0.5,(54)8.5x3.9x=55.2(x18),(55)122x19=(x19)×5, (56)3.5x+2=4x1,(57)= (58)X+(3X16)÷25%=10(X+1) (59) 75

5、47;(x+10)=2,(60)5x3×(28x)=12+2x, (61)6(x+1)=0.5(10x+16), (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=51.63.4x,(72)3(4x2)2(3x+3)=98x,

6、 (73)20+4x=6x24, (74)5(x1)=x+1, (75)3(3x2)=100.5(x3.5), (76)0.4(x0.2)+1.5=0.7x0.38, (77)(0.6x+420)÷(x+20)=3,(78)35(2x)+15(65x)=22x+7+21(43x), (79)5(3x4)2(x1)=5(2x1) (80) x=4.9+x, (81)3x+5×=2x+×, (82)X÷3.2=(18x)÷5, (83)4(4x6)=5(3x+1), (84)10X=3(2X+17)+45, (85)5.7(X0.2)=5.1(X+

7、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, 小学复杂方程专91题参考答案:(1)2x+5=5x7, 2x+52x=5x72x, 3x7=5, 3x7+7=5+7, 3x=12, 3x÷3=12÷3, x=4;(2)3(x2)=25(x2), 3x6=125x, 3x6+5x=125x+5x, 8x6=12, 8x6+6=12+6, 8x=18, 8x&

8、#247;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+16.8116.81=2516

9、.81, x=8.19(5)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(6)X+(3X16)÷=10(X+1), X+(3X16)×4=10X+10, X+12X64=10X+10, 13X64=10X+10, 13X64+64=10X+10+64, 13X=10X+74, 13X10X=10X+7410X, 3X=74, 3X÷3=74÷3, X=(7)x+1=x+3,x+1x=x+3x, x+1=3, x+11=31, x=2(8)

10、6(3x2)4(4x3)=18x, 18x1216x+12=18x, 18x16x+8x=0, 10x=1, x=1÷10, x=;(9)4(x2)+20x4=5(12x), 4x8+20x4=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;(11)35(x2)15(5x6)=(22x63)21(3x4), 35x7075x+90=22x6363x+84, 35x7075x+90-22x+63x=

11、22x63-63x+84-22x+63x x+20=21, X+20-20 =2120, 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+3.5x7, 143.5÷3.5=3.5x÷3.5, x=41(14) x2=0.25x, x2+

12、=0.25x+, x2=0.25, x2+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+7.257.25=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=3x5+5, 2x+6=3x, 2x+62x=3x2x, x=6(17) x+(3x16)÷25%=10(x+1), x+12x64=10x+10, 13x64=10x+10,

13、13x6410x=10x+1010x, 3x64+64=10+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+3x3x, 2x2=24, 2x2+2=24+2, 2x=26, 2x÷2=26÷2, x=13(21) 8(x2)=2x+7, 8x

14、16+16=2x+7+16, 8x=2x+23, 8x2x=2x+232x, 6x=23, 6x÷6=23÷6, x=3(22) 6(x3.5)=17.8+2x, 6x21=17.8+2x, 6x212x=17.8+2x2x, 4x21+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+3.3683.368, 1.632÷0.2

15、=0.2x÷0.2, x=8.16;(24)(9+):(9)=5:3, 3(9+X)=5(9X), 3×9+3X=5×95X, 27+3X=455X, 3X+5X=4527, 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+12x64=10x+20, x+12x10x=20+64, 3x=84, 3x÷3

16、=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÷(X055)×(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+

17、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+12.512.5=1512.5, 7.5x=2.5,7.5x÷7.5=2.5÷7.5, x=(30) 60÷(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)=

18、6(x5) x=6x30 +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=342152 5x=190 5x÷5=190÷5 x=38(34)1÷(x45%)=2.8, 1.4÷(x0.45)=2.8, x0.45=1.4

19、7;2.8, x0.45=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=26.620, 6x÷6=6.6÷6,(36)100×0.5+(x100)×0.4=0.48x 0.4x+10=0.48x 0.4x+100.4x=0.48x0.4x 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+43x, x+4=6, x+44=64, x=2(

20、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=52x3276x152+152=52x32+152 76x=52x+120 76x52x=52x+12052x 24x=120 24x÷24=120÷24 x=5(40)81x342=76(x2) 81x342=76x152,81x342+342=76x152+342, 81x=76x+190 81x76x=76x+19076x 5x=190 5x÷5=190÷5 x=

21、38(41)3(2x)+5(4x3)=4(x+1) 63x+20x15=4x+4 17x9=4x+4 17x4x+99=4x4x+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 16+x=12+3x 3xx=1612 2x=4 x÷2=4÷2 x=2(44)2(x4)=3(x12) 2x8=3x36 2x82x=3x2x36 8=x36 8+36=x36+36 x=28;(45)0.4÷(4x)=1÷4 = 1.

22、6=4x 1.6+x=4x+x 1.6+x=4 1.6+x1.6=41.6 x=2.4;(46)8(x2)=2(x+7), 8x16=2x+14, 8x162x=2x+142x, 6x16+16=14+16, 6x÷6=30÷6, x=5(47)30%x+85=70%x+25, 0.3x+850.3x=0.7x+250.3x, 0.4x+25=85, 0.4x+2525=8525, 0.4x=60, 0.4x÷0.4=60÷0.4, x=150;(48)8.5×1.25.3x=8.54x 10.25.3x=8.54x10.25.3x+5.3x8

23、.5=8.54x+5.3x8.5 1.3x=1.7 1.3x÷1.3=1.7÷1.3 x=(49)5x2(32x)=16x23 5x6+4x=16x23 9x6=16x23 9x69x+23=16x239x+23 7x=17 7x÷7=17÷7 x=(50)(x5)×59=(x12)×12 5x259=12x144 5x34=12x144 5x345x+144=12x1445x+144 7x=110 7x÷7=110÷7 x=(51)(10x)÷2=5x7 10x=10x14 10x+x+14=10x14

24、+x+14 11x=24 11x÷11=24÷11 x=(52)2.7x1.8=1.2x+2.7, 2.7x1.8+1.8=1.2x+2.7+1.8, 2.7x1.2x=1.2x+4.51.2x, 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=55.2x993.6, 4.6x4.6x=

25、55.2x993.64.6x, 50.6x993.6=0,50.6x993.6+993.6=993.6, 50.6x=993.6, 50.6x÷50.6=993.6÷50.6, x=19.;(55)122x19=(x19)×5, 103x=5x95, 103x+x=5x95+x, 103+95=6x95+95, 198÷6=6x÷6, x=33;(56)3.5x+2=4x1,3.5x+23.5x=4x13.5x, 2+1=0.5x1+1, 3÷0.5=0.5x÷0.5, x=6(57)= 3.5(X16)=1.5X, 3.5

26、X56=1.5X 3.5X56+56=1.5X+56 3.5X1.5X=56 2X=56 X=28,(58)X+(3X16)÷25%=10(X+1) X+(3X16)×4=10X+10 X+3X×416×4=10X+10 13X64=10X+10 13X64+64=10X+10+64 13X=10X+74 13X10X=10X+7410X 3X=74 X=(59) 75÷(x+10)=2,75÷(x+10)×(x+10)=2×(x+10), 2x+20=75, 2x+2020=7520, 2x=55, 2x

27、7;2=55÷2, x=27.5;(60)5x3×(28x)=12+2x, 8x84=12+2x, 8x84+84=12+2x+84, 8x=96+2x, 8x2x=96+2x2x, 6x=96, 6x÷6=96÷6, x=16(61)6(x+1)=0.5(10x+16), 6x+6=5x+8, 6x+66=5x+86, 6x5x=5x+25x, x=2 (62)5(x+2)=4(x+9), 5x+10=4x+36, 5x4x=3610, x=26;(63)127.5÷(2x+3)=15,127.5÷(2x+3)×(2x+3

28、)=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;(64)3(x+2)=4(x+1), 3x+6=4x+4, 3x+63x=4x+43x, x+4=6, x+44=64, 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+12.6x, 7x=12.6, 7x÷7=12.6&#

29、247;7, x=1.8;(66)7(x+6)3x=4(2x+5), 7x+423x=8x+20, 4x+42=8x+20, 4x+424x=8x+204x, 4x+20=42, 4x+2020=4220, 4x=22, 4x÷4=22÷4, x=5.5;(67)4x2(5.5x)=3.5x8, 4x11+2x=3.5x8, 6x11=3.5x8, 6x11+11=3.5x8+11, 3.5x+3=6x, 3.5x+33.5x=6x3.5x, 2.5x=3, 2.5x÷2.5=3÷2.5, x=1.2(68)2.8x=19.326.4x, 2.8x+6.

30、4x=19.326.4x+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), 5y2049+7y9=1227+3y, 12y78=3y15, 12y78+78=3y15+78, 12y3y=3y+633y, 9y=63, 9y÷9=63÷9, y=7(70)35(x2)15(5x6)=22x6321(3x4), 35x7075x+90=22x6363x+84, 35x75x22x+63x=63+8490+70, x=1(71)2.6x=51.63.4x,2.6x+3.4

31、x=51.63.4x+3.4x, 6x=51.6, 6x÷6=51.6÷6, x=8.6;(72)3(4x2)2(3x+3)=98x, 6x12=98x, 6x12+8x=98x+8x, 14x12=9, 14x12+12=9+12, 14x=21, 14x÷14=21÷14, x=1.5;(73)20+4x=6x24, 20+4x4x=6x244x, 2x24=20, 2x24+24=20+24, 2x=44, 2x÷2=44÷2, x=22;(74)5(x1)=x+1, 5x5=x+1, 5x5x=x+1x, 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, 9x6+0.5x=11.750.5x+0.5x, 9.5x6=11.75, 9.5x6+6=11.75+6, 9.5x=17.75, 9.5x÷9.5=17.75÷9.5, x=;(76)0.4(x0.2)+1.5=0.7x0.38,

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