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  解一元一次方程的练习题附答案

  解一元一次方程的练习题附答案

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2020-05-14 18:55
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  一元一次方程有答案

  1、x/4=-x/2+3

  x/4+x/2=3

  3x/4=3

  x=4

  2、1/2(x*x-y)+1/3(x-y*y)+1/6(x*x+y*y)

  =1/2x^2-1/2y+1/3x-1/3y^2+1/6x^2+1/6y^2

  =2/3x^2-1/2y+1/3x-1/6y^2

  3、x/4=-x/2+34、

  x/4+x/2=34

  3x/4=34

  x=34

  4、(x+0.5)+x=17

  2x=17-0.5

  x=8.25

  5、x+14/7=x+20/4

  4(x+14)=7(x+20)

  4x+56=7x+140

  3x=-84

  x=-28

  6、x+15/5=1/2—x—7/3

  6(x+15)=15-10(x-7)

  6x+90=15-10x+70

  16x=-5

  x=-5/16

  7、-3x=15

  x=15/(-3)

  x=-5

  8、-n/3-2=10

  -n/3=12

  n=-36

  9、3x+3=2x+7

  3x-2x=7-3

  x=4

  10、5/12x-x/4=1/3

  5x-3x=4

  2x=4

  x=2

  11、2/3—8x=3-x/2

  4-48x=3(3-x)

  4-48x=9-3x

  -45x=5

  x=-1/9

  12、0.5x-0.7=6.5-1.3x

  0.5x+1.3x=6.5+0.7

  1.8x=7.2

  x=4

  13、3x-6/6=2x/5-3

  5(3x-6)=12x-90

  15x-30=12x-90

  3x=-60

  x=-20

  没有答案

  1.2(x-2)-3(4x-1)=9(1-x)

  2.11x+64-2x=100-9x

  3.15-(8-5x)=7x+(4-3x)

  4.3(x-7)-2[9-4(2-x)]=22

  5.3/2[2/3(1/4x-1)-2]-x=2

  6.2(x-2)+2=x+1

  7.0.4(x-0.2)+1.5=0.7x-0.38

  8.30x-10(10-x)=100

  9.4(x+2)=5(x-2)

  10.120-4(x+5)=25

  11.15x+863-65x=54

  12.12.3(x-2)+1=x-(2x-1)

  13.11x+64-2x=100-9x

  14.14.59+x-25.31=0

  15.x-48.32+78.51=80

  16.820-16x=45.5×8

  17.(x-6)×7=2x

  18.3x+x=18

  19.0.8+3.2=7.2

  20.12.5-3x=6.5

  21.1.2(x-0.64)=0.54

  22.x+12.5=3.5x

  23.8x-22.8=1.2

  24.150x+10=60

  25.260x-30=20

  26.33^20x+50=110

  27.42x=5x-3

  28.590=10+x

  29.690+20x=30

  30.7691+3x=700

  多项式计算

  1.(14x^2+12x^3y+16x^4y^3)/(-4x^2)

  =7/2-3xy-4x^2y^3

  2.(16×10^17)/(0.2×10^7)

  =16/0.2

  =80

  3.-4/3a^2b^2(3/2a^2+9/4ab-27/8b^2)

  =-2a^4b^2-3a^3b^3+9/2a^2b^4

  4.(x-2)(x-3)+2(x+6)(x-5)-3(x^2-7x+3)

  =x^2-5x+6+2x^2+2x-60-3x^2+21x-9

  =18x-63

  (1)(x+2y)(5a+3b);(2)(2x-3)(x+4);

  (3)(x+y)2;(4)(x+y)(x2-xy+y2)

  (1)(x+2y)(5a+3b)

  =x·5a+x·3b+2y·5a+2y·3b

  =5ax+3bx+10ay+6by;

  (2)(2x-3)(x+4)

  =2x2+8x-3x-12

  =2x2+5x-12

  (3)(x+y)2

  =(x+y)(x+y)

  =x2+xy+xy+y2

  =x2+2xy+y2;

  (4)(x+y)(x2-xy+y2)

  =x3-x2y+xy2+x2y-xy2+y3

  =x3+y3

2020-05-14 18:59:53

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