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问题: 要使(4-x)/(4-2x)的值与(x-4)/(x-5)的值相等,x=?

要使(4-x)/(4-2x)的值与(x-4)/(x-5)的值相等,x=?

解答:

(4-x)/(4-2x)=(x-4)/(x-5)
(4-x)/(4-2x)=(4-x)/(5-x)
4-2x=5-x,x=-1