Zadanie
a)
-5c(-2c + 3b - 4) + (-3b - 5c + 2) - (7b + 4c - 5) =
= 10c² - 15bc + 20c - 3b - 5c + 2 - 7b - 4c + 5 = 10c² - 15bc - 10b + 11c + 7
b)
4(2p - 3r) + 2p(-5p + 2r) - 4r(-r - p) = 8p - 12r - 10p² + 4pr + 4r² + 4pr =
= -10p² + 4r² + 8pr + 8p - 12r
c)
12(1/3z - 1/6w) - 24(1/8w + 1/6z) + 6(1/3z - 1/2w) = 4z - 2w - 3w - 4z + 2z - 3w =
= 2z - 8w
