1. Przedstaw w postaci iloczynu.
a) 3(z - y) - a(z - y)
b) (m - 1)(k - 1) + (k - 1)(m +1)
c) (a - 1)(b + c) - (a - 1)(b - c)
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a) (z-y)(3-a)
b)(k-1)2m
c) a-1