(5a³-2a²+3)-(1-2a+a²)+3(-1+3a-a²)

问题描述:

(5a³-2a²+3)-(1-2a+a²)+3(-1+3a-a²)

原式=5a³-2a²+3-1+2a-a²-3+9a-3a²
=5a³-6a²+11a-1