August 2018 2 11 Report
Oblicz sprytnie (wyłącz wspólny czynnik przed nawias)
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)57²-57×55=
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