Объяснение:
a) (2a + 4)(5a + 6)=2а*5а+4*5а+6*2а+4*6=+32а+24=
б) (7b - 3)(8b + 4)=7b*8b-3*8b+4*7b-3*4=
Объяснение:
a) (2a + 4)(5a + 6)=2а*5а+4*5а+6*2а+4*6=
+32а+24=
б) (7b - 3)(8b + 4)=7b*8b-3*8b+4*7b-3*4=