1 1 1 1--- + --- = --- + ---X+5 X+8 X+6 X+7 要分解因式

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1 1 1 1--- + --- = --- + ---X+5 X+8 X+6 X+7 要分解因式
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1 1 1 1--- + --- = --- + ---X+5 X+8 X+6 X+7 要分解因式
1 1 1 1
--- + --- = --- + ---
X+5 X+8 X+6 X+7 要分解因式

1 1 1 1--- + --- = --- + ---X+5 X+8 X+6 X+7 要分解因式
1/(x+5)+1/(x+8)=1/(x+6)+1/(x+7)
1/[x+5]-1/[x+6]=1/[x+7]-1/[x+8]
[x+6-(x+5)]/[x+5][x+6]=[x+8-(x+7)]/[x+8][x+7]
1/[x+5][x+6]=1/[ x+7][x+8]
[x+5][x+6]=[x+7][x+8]
x^2+11x+30=x^2+15x+56
-4x=26
x=-13/2

这是 什么题目啊