Hej!
a)
1/5 • (10x(6y + 5)) + 1/2 • (8x + 6y) =
= 1/5 • (60xy + 50x) + 4x + 3y =
= 12xy + 10x + 4x + 3y = 12xy + 14x + 3y
b)
x(2x - 3y + 4) - 5y(4x + 3y - 2) =
= 2x² - 3xy + 4x - 20xy - 15y² + 10y =
= 2x² - 15y² - 23xy + 4x + 10y
Pozdrawiam! - Julka
