计算:(1)(x+1)²-x(x+2) (2)计算:(a²-4/a+2)+a+2

问题描述:

计算:(1)(x+1)²-x(x+2) (2)计算:(a²-4/a+2)+a+2

(1)原式=x²+2x+1-x²-2x=1
(2)原式=(a+2)(a-2)/(a+2)+a+2
=a-2+a+2
=2a