October 2018 1 57 Report

Oblicz sprytnie ( wyłącz wsp.ólny czynnik przed nawiasem) :

a) 28*17-28*15

b) 134*135-133*135

c) 31*15-62*7

d) 12*13-6*26

e) 13*49-26*27

f) 57(potęga 2) -57*55

daję naj. :)


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