Объяснение:
(a+b)²=a²+2ab+b2
a²+14a+49+a²+5a-2a-10-7a=2a²+10a+39
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Объяснение:
(a+b)²=a²+2ab+b2
a²+14a+49+a²+5a-2a-10-7a=2a²+10a+39