化简 (2a²-5a)-2(3a-5+a²),a=1...

问题描述:

化简 (2a²-5a)-2(3a-5+a²),a=1
...


(2a²-5a)-2(3a-5+a²)
=(2a²-2a²)+(-5a-6a)+10
=-11a+10
=-11×1+10
=-1

(2a²-5a)-2(3a-5+a²)
=2a²-5a-6a+10-2a²
=-11a+10
=-11*1+10
=-1