Odpowiedź:
Punkt 1
-1 + a/2 = -1 + (-2/2) = -1 + (-1) = -2
4 - a = 4 - ( -2) = 4 + 2 = 6
2/3(a-1) = 2/3 (-2 -1) = 2/3 (-3) = 2/3 * (-3/1) = 2 * (-1) = -2
2a + 2 = 2 * (-2) + 2 = -4 + 2 = -2
1. PRAWDA
-1 + a/2 = -1 + 1/2 = -1/2
4 - a = 4 - 1 = 3
2/3(a-1) = 2/3 (1-1) = 2/3 * 0 = 0
2a + 2 = 2 * 1 + 2 = 4
2. FAŁSZ bo 0 nie jest ani dodatnie ani ujemne więc sa tylko 2 liczby dodatnie