а)(х+2)+3х=4х+2;
(х+2)*3х=3х²+6х.
б) (х-3)+(2х+1)=3х-2;
(х-3)(2х+1)=2х²+х-6х-3=2х²-5х-3
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а)(х+2)+3х=4х+2;
(х+2)*3х=3х²+6х.
б) (х-3)+(2х+1)=3х-2;
(х-3)(2х+1)=2х²+х-6х-3=2х²-5х-3