October 2018 1 48 Report

Dla dowolnych wartości x i y prawdziwa jest równość :

A) 6x(x-2)+5=6x2-12x+5

B) (x-y)(x+y)=x2+xy+y2

C) (x-2)y+1=xy+2y+1

D) x+y/2 =2x-2y/2



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