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Автор - саша1620

Упрости выражение:

a+(-b)-(-2a)=

-a-(-b)-4a=

-a-(+a)+2b-(-b)=

-a-(+3a)+(-b)-b=

Ответ

Автор - chelovekbatman
1) 3а-b 
2) -5a+b
3) -2a+3b
4)-4a-2a

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