September 2018 1 18 Report

Mialem sprawdzian z matematyki i nie pamietam jaki byl procent :

Kupiono 2 ksiazki za 9 zl jedna bylo o x% drozsza od drugiej .
I wyszlo ze :
4zł-1 ksiazka
5zł-2 ksiazka

Jaki moglbyc procent ? plx xD

zeby obliczyc ten x%


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