упростите выражение:
1)a+(-b)-(-2a)=
2)-a-(+a)+2b-(-b)=
3)-a-(-b)-4a=
4)-a-(+3a)+(-b)-b=
1)a+(-b)-(-2a)=
2)-a-(+a)+2b-(-b)=
3)-a-(-b)-4a=
4)-a-(+3a)+(-b)-b=
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Answers & Comments
2)3b;
3)-5a+b;
4)2a-2b;
1)a-b+2a=3a-b
2)-a-a+2b+b=-2a+3b
3)-a+b-4a=-5a+b
4)-a-3a-b-b=-4a-2b