August 2018 1 19 Report
Proszę o dokładne wytłumaczenie i rozwiązanie zadań.
a) 4 ( 5 + x ) =
b) 3 ( a +b ) =
c) 6x +3 y =
d) 12 a + 9 b +15 c =
e) 5x-15y- 20z =
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