1) ......=3a²-2a-a³+2a+3a²+12= - a³+6a²+12=a³-6a²-12
2) ....=3b³-4b²-3b-4b²+4+b³-3b=4b³-8b²+4=4(b³-2b²+1)
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1) ......=3a²-2a-a³+2a+3a²+12= - a³+6a²+12=a³-6a²-12
2) ....=3b³-4b²-3b-4b²+4+b³-3b=4b³-8b²+4=4(b³-2b²+1)