РЕШИТЕ ПЖ ДАМ 17 БАЛЛОВ
РАСКРЫТЬ СКОБКИ.
(5X-У)(8X+2У)
(6а+7в)(8а+3в)
(а+3в)^2
РАСКРЫТЬ СКОБКИ.
(5X-У)(8X+2У)
(6а+7в)(8а+3в)
(а+3в)^2
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Answers & Comments
1). (5x-y)*(8x+2y)=40x^2+10xy-8xy-2y^2=40x^2+2xy-2y^2; 2).(6a+7b)*(8a+3b)=48a^2+18ab+56ab+21b^2=48a^2+74ab+21b^2; 3).(a+3b)^2=a^2+6ab+9b^2.