Hej!
a]
x(x - 2) + 2(x + x² - 5) =
= x² - 2x + 2x + 2x² - 10 =
= 3x² - 10
b]
a(a - b) - 2a(b - a) =
= a² - ab - 2ab + 2a² =
= 3a² - 3ab
c]
s(-t + 1) - t(s - w + t) =
= -st + s - st + tw - t² =
= -t² + tw - 2st + s
d]
-m(n - o) - 3o(-m + n) =
= -mn + mo + 3mo - 3no =
= 4mo - mn - 3no
e]
c(a + b - 2c) + 2b(-c - a) =
= ac + bc - 2c - 2bc - 2ab =
= -2ab - bc + ac - 2c
f]
x(y² - y) + y(-x² + x) =
= xy² - xy - x²y + xy =
= xy² - x²y
Pozdrawiam! - Jula
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