我给你算一下啊
1/2=-1+根(1-4a)/2
先通分1=-1+根(1-4a)
2=根(1-4a)
4=1-4a
3=-4a
a=-3/4
log1/2 {-1+根号(1-4a)/2}=1,a=?
3个回答
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