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