August 2018 1 53 Report
Oblicz sprytnie (wyłącz wspólny czynnik przed nawias) :

a) 28 * 17 - 28 * 15
b) 134 * 135 - 133 * 155
c) 31 * 15 - 62 * 7
d) 12 * 13 - 6 * 26
e) 13 * 49 - 26 * 27
f) 52² - 57 * 55

( poproszę z obliczeniami).
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