October 2018 1 29 Report

-5x(2x + 3y_ -0,5 (4x -2y)=

ja to liczę tak:

-5x(2x + 3y_ -0,5 (4x -2y)=-10x - 15 xy - 2 xy + y^2(do potegi 2)=- 10x - 17 xy + y^2

Czy to jest dobrze?proszę o poprawne obliczenie(na poziomie 3 gimnazjumn;))


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