8-3x=0.5解方程-搜答案-大师作文网

(x+3)/(x+2)+(x+9)/(x+8)=(x+5)/(x+4)+(x+7)/(x+6)1+(x+5)/(x+2)(x+8)=1+(x+5)/(x+4)(x+6)x=-5再问：第二步那个1是怎么

将x-7/x-9分解成1+2/(x-9)其他分式同理则原方程等价于1/x-9+1/x-5=1/x-6+1/x-81/x-6-1/x-5=1/x-9-1/x-81/(x-5)(x-6)=1/(x-8)(

25-3X=13X=25-13X=24X=812+6X=246X=12X=20.5X÷8=40.5X=32X=64

x(2x-4)+3x(x-1)=5x(x-3)+82x²-4x+3x²-3x=5x²-15x+88x=8x=1

3x+8=41 解方程

3x+8=413x＝41－83x＝33x＝33÷3x＝11

5+3x=17.6-x3x+x=17.6-54x=12.6x=12.6/4x=3.15

令2x-11=0,得x=11/2令x-3=0,得x=3令x-8=0,得x=8当x

通分得[（x-8）(x-4)-(x-9)(x-3)]/(x-3)(x-4)=[(x+7)(x+3)-(x+2)(x+8)]/(x+8)(x+3)解得5/(x-3)(x-4)=5/(x+8)(x+3),

(x^2+x)(x^2+x-3)-3(x^2+x)+8=0（x^2+x)^2-6(x^2+x)+8=0(x^2+x-4)(x^2+x-2)=0x^2+x-4=0x^2+x-2=0(x+1/2)^2=1

(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)[（x-8）(x-4)-(x-9)(x-3)]/(x-3)(x-4)=[(x+7)(x+3)-(x+2)(

0.5+50%X=3 解方程

0.5x=2.5x=5

1/8X(x+0.5)=7/12x+0.5=14/3x=25/6

首先由题意得x+1≠0,x+7≠0,x+5≠0,x+3≠0,即x≠-1,x≠-7,x≠-5,x≠-3,则先简化方程(x+1+1)/(x+1)+(x+7+1)/(x+7)=(x+5+1)/(x+5)+(

用换元法设x*x+11x-8＝A然后再做

8x-0.5x=157.5x=15x=15/7.5x=2

方程两边同时乘以15（x+8）-（x-3）=2+10（0.2x+0.7）5x+40-x+3=2+2x+74x+43=2x+92x=-34x=-17

令X^2+X=YY(Y-3)-3Y+8=0Y^2-6Y+8=0(Y-2)(Y-4)=0y=2Y=4X^2+X=2x^2+x=4x^2+x-2=0x^2+x-4=0(x+2)(x-1)=0X=1/2(-

5x-0.5=8解方程

5x-0.5=85x=8+0,55x=8.5x=8,5÷5x=1.7