大师作文网12-2x=7,6解方程
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/12 19:17:04
(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
((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
x²-7x=12x²-7x+49/4=12+49/4(x-7/2)²=97/4x-7/2=±√97/2x=(7-√97)/2,x=(7+√97)/2
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
5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/(x-2)(x+3)+(2x-5)/(x+3)(x-4)=(7x-10)
提出x得到：x*(1-1/2+1/2-1/3+1/3-1/4……+1/2008-1/2009)=2008接着：x*(1-1/2009)=2008最后：x=2009
(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)(5-2x)/(x-4)(x+3)=5x/(x+3)(x-2)+(10-7x)/(x-2)(x-4)分
再问：2x是怎么得来的
2x^2约掉剩下-12X+12再把X=1/6代入得10再问：我少写了一个负号，应该是2x^2-5x-7x-2x^2+12,其中x=-1/6再答：那就代X=-1/6前面不变，答案为14
7/(x^2+x)+3/(x^2-x)=6/(x^2-1)7/x(x+1)+3/x(x-1)=6/(x-1)(x+1)分子分母同乘以x(x-1)(x+1),得7（x-1）+3（x+1)=6x10x-4
通分化简得到(x+1)(x+2)=(x+5)(x+6)3x+2=11x+308x=-28x=-7/2
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)+(
6X=7（X-12）6X=7X-847X-6X=84X=84
2再问：过程再答：
5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/[(x+3)(x-2)]+(2x-5)/[(x-4)(x+3)]=(7x
0或44/7
9x+2.1=12,9x=12-2.1,9x=9.9,x=1.1
移项,得x=12再问：过程再答：7x=6x+127x-6x=12x=12
你懒惰了,通分得：50x=300x=6
x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6)1+2/(x-2)+1-2/(x-7)=1+2/(x-1)+1-2/(x-6)1/(x-2)-1/(x-7)=1/