1/(x-10)+1/(x-6)=1/(x-7)+1/(x-9)

　　1/(x-10)-1/(x-9)=1/(x-7)-1/(x-6)

　　[(x-9)-(x-10)]/(x-10)(x-9)=[(x-6)-(x-7)]/(x-7)(x-6)

　　即是

　　1/（x-9)(x-10)=1/(x-6)(x-7)

　　x^2-13x+42=x^2-19x+90

　　6x=68

　　得出：x=8

　　经检验,X=8是方程的解

　　还有没？追加悬赏哦~

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