根号(4x^2+2x+1/4)(x

问题描述:

根号(4x^2+2x+1/4)(x

根号(4x^2+2x+1/4)
=√[(2x)²+2×2x×½+(½﹚²]
=√﹙2x+½﹚²
=│2x+½│
=-(2x+½)
=-2x-½