a = 3; b = 2; x = 4;
1)
(a + b) · 5 + 9a + 3b = 5a + 5b + 9a + 3b = 14a +8b
14 · 3 + 8 · 2 = 42 + 16 = 58
2)
13 · (a + b) - 7b + 4a = 13a + 13b - 7b + 4a = 17a + 6b
17 · 3 + 6 · 2 = 51 + 12 = 63
3)
6 · (x + a) - 5a = 6x + 6a - 5a = 6x + a
6 · 4 + 3 = 24 + 3 = 27
4)
30x - (5x + 4x) = 30x - 9x = 21x
21 · 4 = 84
a = 3; b = 2; x = 4;
1)
(a + b) · 5 + 9a + 3b = 5a + 5b + 9a + 3b = 14a +8b
14 · 3 + 8 · 2 = 42 + 16 = 58
2)
13 · (a + b) - 7b + 4a = 13a + 13b - 7b + 4a = 17a + 6b
17 · 3 + 6 · 2 = 51 + 12 = 63
3)
6 · (x + a) - 5a = 6x + 6a - 5a = 6x + a
6 · 4 + 3 = 24 + 3 = 27
4)
30x - (5x + 4x) = 30x - 9x = 21x
21 · 4 = 84