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b) (1 - p) (3p - 4) - 3p = 3p -4 - 3p^2 + 4p = -3p^2 + 7p - 4
c) (k-0,5l) (k+6) +k^2 = k^2 + 6k - 0,5lk - 3l + k^2 = 2k^2 + 6k - 0,5lk-3l
d) (c-1,5c) (12+c) -c^2 = 12c + c^2 - 18c - 1,5c^2 - c^2 = -1,5c^2 - 6c