计算:[(x-y)^2+3(x^2-(1/3)y^2)]/2x

问题描述:

计算:[(x-y)^2+3(x^2-(1/3)y^2)]/2x


原式
=[(x²-2xy+y²)+3x²-y²]/2x
=(4x²-2xy)/2x
=2x-y