October 2018 2 34 Report

sumy algebraiczne doprowadż do najprostszej postaci , licz sprytnie.

-5x+2x-(-4y)-2x+(-4y)=

4a+7b-13a+2b-7b+13a=

-39c+16-15d+24-(-15d)+d+39c=

plisss dam najj!!! i janusza!!


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