Ответ:
1. -7(4-b)+2(-2b-2)-6(-9+b)=-28+7b-4b-4+54-6b=22-3b
2. -2,5b•(-4)=10b
3. -6(4a+8)-(3+a)+3(8+6a)=-24a-48-3-a+24+18a=-27-7a
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Ответ:
1. -7(4-b)+2(-2b-2)-6(-9+b)=-28+7b-4b-4+54-6b=22-3b
2. -2,5b•(-4)=10b
3. -6(4a+8)-(3+a)+3(8+6a)=-24a-48-3-a+24+18a=-27-7a