计算（－b/a）²·a/2b²+1/a ,
问题描述：
计算（－b/a）²·a/2b²+1/a ,
答
解原式
=(b^2/a^2×a)/2b^2+1/a
=(b^2/a)/2b^2+1/a
=1/2a+1/a
=1/2a+2/2a
=3/2a.