February 2019 0 6 Report
6. 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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