3х²-5х+4+3х-2х²-1=х²-2х+3 сумма
3х²-5х+4-(3х-2х²-1)=3х²-5х+4-3х+2х²+1=5х²-8х+5 разность
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3х²-5х+4+3х-2х²-1=х²-2х+3 сумма
3х²-5х+4-(3х-2х²-1)=3х²-5х+4-3х+2х²+1=5х²-8х+5 разность