解方程1/(x-7)-1/(x-5)=1/(x-6)-1/(x-4)
1个回答
展开全部
1/(x-7)-1/(x-5)=1/(x-6)-1/(x-4)
(x-5-x+7)/(x-7)(x-4)=(x-4-x+6)/(x-4)(x-6)
x^2-11x+28=x^2-10x+24
x=4
(x-5-x+7)/(x-7)(x-4)=(x-4-x+6)/(x-4)(x-6)
x^2-11x+28=x^2-10x+24
x=4
追问
(x-5-x+7)/(x-7)(x-4)应该是(x-5-x+7)/(x-7)(x-5)吧?
追答
抱歉。您说的对。
(x-5-x+7)/(x-7)(x-5)=(x-4-x+6)/(x-4)(x-6)
x^2-12x+35=x^2-10x+24
11=2x
x=11/2
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