October 2018 2 41 Report

wykonaj działania:

-4xy(5x+8y-7)

(3,5x+1,7y)-4(1,5x-2)+(0,3y-3)

Oblicz wartość liczbową wyrażeń

a) 7ab-dla a-4 i b- -2

b) x kwadrat-2xy dla x=2 i y=-1


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