(5a³-2a²+3)-(1-2a+a²)+3(-1+3a-a²)
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(5a³-2a²+3)-(1-2a+a²)+3(-1+3a-a²)
(5a³-2a²+3)-(1-2a+a²)+3(-1+3a-a²)
(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