Odpowiedź:
zad 4
a) 2x + 3y = 2 × 2 + 3 × (-2) = 4 + (-6) = -2
b) 2a² - b + 4 = 2 × 3² - 10 + 4 = 2 × 9 - 10 + 4 = 18 - 10 + 4 = 12
c) (x² - 5) ÷ 2 + x = (5² - 5) ÷ 2 + 5 = (25 - 5) ÷ 2 + 5 = 20 ÷ 2 + 5 = 10 + 5 = 15
zad
a) (2x - 5) - (-4x + 3) = 2x - 5 + 4x - 3 = 6x - 8
b) (x - 2)(x + 4) = x - 2 + x + 4 = 2x + 2
c) 3(2a - 4) - (2 + 7a) = 6a -12 - 2 - 7a = -a -14
d) (4 - 2t) (5 + 3t) = 4 - 2t + 5 + 3t = 9 + t
