Hej!
Zadanie 1 :
7 + (5x + 4) = 7 + 5x + 4 = 5x + 11
3x + (y - 2x) = 3x + y - 2x = x + y
(4 - 2x) + (7x - 2) = 4 - 2x + 7x - 2 = 5x - 2
(4a - 7b) + (2a + 3b) = 4a - 7b + 2a + 3b =
= 6a - 4b
Zadanie 2 :
2a - (3a - 7) = 2a - 3a + 7 = -a + 7
-(2x - 3) - x = -2x + 3 - x = -3x + 3
(2p - 1) - (3 + 5p) = 2p - 1 - 3 - 5p = -3p - 4
-(2x - 1) - (3x + 1) = -2x + 1 - 3x - 1 = -5x
(2m + 4n) - (m - 0,5n) = 2m + 4n - m + 0,5n =
= m + 4,5n
Pozdrawiam! - Julka