Объяснение:
(7b+5b)^2=(7b)^2+2*7*5*b*b+(5b)^2=49b^2+60b^2+25b^2=134b^2
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Объяснение:
(7b+5b)^2=(7b)^2+2*7*5*b*b+(5b)^2=49b^2+60b^2+25b^2=134b^2