作业帮7x-3x=20方程
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/16 10:03:30
(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)(
((X-2)(X-4)-(X-3)^2)/(X-3)(X-4)=((X-5)(X-7)-(X-6)^2)/(X-6)(X-7),-1/(X^2-7X+12)=-1/(X^2-13X+42),6X=30
我给个思路吧（X+2-1/X+2)-(X+3-1/X+3)=（X+6-1/X+6)-(X+7-1/X+7)1-1/(X+2)-1+1/(X+3)=1-1/(X+6)-1+1/(X+7)剩下的就自己解决
7x-2x+3x=365x+3x=368x=36x=4.5
左右两边同时乘以3再问：为什么我算的是15/13再答：答案不是这个吗？
4x-3(20-x)=5x4x-60+3x=5x2x=60x=30
4x-3(x-20)=6x-7(9-x)4x-3x+60=6x-63+7xx-7x-6x=-63-60-12x=-123x=10.25
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+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)(
通分化简得到(x+1)(x+2)=(x+5)(x+6)3x+2=11x+308x=-28x=-7/2
3x-20+4x=x+403x+4x-x=40+206x=60x=10
（7-2+3）X=368X=36X=9/2
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)+(
2(x-3)(x+5)=x^2+(x+2)(x-2)+(x+7)2(x^2+2x-15)=x^2+x^2-4+x+72x^2+4x-30=2x^2+x+33x=33x=11
再答：采纳吧再答：有过程
4X-12+16=7X-20去括号4X+4=7X-20(16-12)20+4=7X-4X(4X移动到右边20移动到左边加变减,减号边加号)24=3X(两边分别相加减)8=XX=8(其实X先在左右都一样
x²-10x-24=0（x-12）（x+2）=0x=12或x=-2
X-1/X-2-(X-2)/(X-3)=(X-5)/(X-6)-(X-6)/(X-7)(X-1)(X-3)-(X-2)²/（X-2）（x-3）=（X-5)(X-7)-(X-6)²/
4x-60+3x=37x=63x=9