方程X/1-X=2X/1-aX的一个根是x=-1/2．求a的值
人气：415 ℃ 时间：2019-10-24 13:49:37
解答
将x=-1/2代入得:-1/2/(1+1/2)=-1/2 *2/(1+a/2)
即1+a/2=3
a=4
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