化简:根号下4x^2-12x+9-根号下4x^2-20x+25(2分之3
问题描述:
化简:根号下4x^2-12x+9-根号下4x^2-20x+25(2分之3
答
根号下4x^2-12x+9-根号下4x^2-20x+25
=根号下(2x-3)^2-根号下(2x-5)^2
=2x-3-[-(2x-5)]
=2x-3+2x-5=4x-8