Помогите плиз.1).упростить выражения
1) - 2,4a*(-5b)=
2)9a-a-8b+3b=
3) a+(a-10)-(15+a)=
4)-4(b-4)+7(b+2)=
1) - 2,4a*(-5b)=
2)9a-a-8b+3b=
3) a+(a-10)-(15+a)=
4)-4(b-4)+7(b+2)=
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Answers & Comments
8a-5b
a-25
-4b+16+7b+14=3b+30