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a)
P = (x + 5)(y + 1) = xy + x + 5y + 1
Wpisać w pola od lewej do prawej:
x | 5
xy | 5y
b)
P = (2x + 7)(¹/₂y + 3) = xy + 6x + 3,5y + 21
6x | 21
xy | 3,5y