Упростите выражение (напишите ответ на вопросы) 1)-2,4a * (-5b)=
2)9a-a-8b+3b=
3)a+(a-10)-(15+a)=
4)-4(b-4)+7(b+2)
Найдите значение выражения
(3,25-(-1,75)) : (-0,6)+0,8*(-7)
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