упростите выражения:
1) -2,4а*(-5b) 3) а+(а-10)-(15+а)
2)9а-а-8b+3b 4) -4(b-4)+7(b+2)
1) -2,4а*(-5b) 3) а+(а-10)-(15+а)
2)9а-а-8b+3b 4) -4(b-4)+7(b+2)
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2)9а-а-8b+3b =8a-5b
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