September 2018 1 47 Report

Które z wyrażeń jest średnią arytmetyczną liczb: \frac{k}{2}, \frac{2l}{3} i \frac{3m}{4}?

a) \frac{1}{2}k+\frac{2}{3}l+\frac{3}{4}2

b) 1\frac{11}{12}klm

c) \frac{1}{6}k+\frac{2}{9}l+\frac{1}{4}m

d) \frac{23}{36}klm


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