Ответ:
1. 2а^2+а(6+b)
2.2a(a+3)+b(3+a)
3.a(2a+b)+3(b+2a)
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Ответ:
1. 2а^2+а(6+b)
2.2a(a+3)+b(3+a)
3.a(2a+b)+3(b+2a)