упростите выражения
1)-2,4а * (-5в)
2)9а - а - 8в + 3в
3)а+(а-10)-(15+а)
4)-4(b-4)+7(b+2)
1)-2,4а * (-5в)
2)9а - а - 8в + 3в
3)а+(а-10)-(15+а)
4)-4(b-4)+7(b+2)
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Answers & Comments
2)9а - а - 8в + 3в=8a-5в
3)а+(а-10)-(15+а)=a+a-10-15-a=a-25
4)-4(b-4)+7(b+2)=-4b+16+7b+14=3b+30