1) Упростите выражение:
1)-2,4а*(-5b)
2)9а-а-8b+3b
3)a+(a-10)-(15+a)
4)-4(b-4)+7(b+2)
2)Найдите значение выражения
(-3,25-(-1,75)):(0,6)+0,8*(-7)
ПОМОГИТЕ СРОЧНО 20 БАЛЛОВ!!!
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