设 y=x^a ,
将x=2,y=1/4 代入可得 a= -2 ,
因此 f(1/2)=(1/2)^(-2)= 4 .
若幂函数y=f(x)的图像经过点（2,1/4）,则f(1/2)=
若幂函数y=f(x)的图像经过点（2,1/4）,则f(1/2)=
数学人气：698 ℃时间：2019-09-24 04:59:59
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