упростите выражение
а) a(b+c)-b(a-c)-c(b+a)=
б) a(b-c)-b(a-c)-c(b-a)=
в) a(b-c)+c(a-b)-b(a-c)=
г) a(a-b)+b(2a+b)+b(2a-b)-a(a+b)=
срочно пожалуйста помогите!!!
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