УПРОСТИТЕ ВЫРАЖЕНИЕ:
a+b+c-(a-b-c)=
7(2a+5b)-5(3b-4a)=
-2(a-3b)+3(b-2a)=
ПРЕДСТАВЬТЕ В ВИДЕ СУММЫ ВЫРАЖЕНИЕ:
1)15a-9;
2)a-b-c
3)x-3y
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