(1)计算:12+2×(-5)+(-3)2+20140;(2)化简:(a+1)2+2(1-a)

2025-06-23 10:18:46
推荐回答(1个)
回答1:

(1)原式=2

3
-10+9+1
=2
3


(2)原式=a2+2a+1+2-2a
=a2+3.