Odpowiedź:
a)
a + (5a - 3b - 4) - 7a = 5a - 3b - 4 - 6a = -a - 3b - 4
b)
(3x - 4a) - (4x + 7a) = 3x - 4a - 4x - 7a = -x - 11a
c)
(x - y + 2z) - (3x + 4y - 5z) + (6x + 7y – 8z) = x - y + 2z - 3x - 4y + 5z + 6x + 7y - 8z = 4x + 2y - z
d)
5b - [b - (4 - 3b) - (5b + 2) + 3b] = 5b - (b - 4 + 3b - 5b - 2 + 3b) = 5b - (2b - 6) =
= 5b - 2b + 6 = 3b + 6
Szczegółowe wyjaśnienie:
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Odpowiedź:
a)
a + (5a - 3b - 4) - 7a = 5a - 3b - 4 - 6a = -a - 3b - 4
b)
(3x - 4a) - (4x + 7a) = 3x - 4a - 4x - 7a = -x - 11a
c)
(x - y + 2z) - (3x + 4y - 5z) + (6x + 7y – 8z) = x - y + 2z - 3x - 4y + 5z + 6x + 7y - 8z = 4x + 2y - z
d)
5b - [b - (4 - 3b) - (5b + 2) + 3b] = 5b - (b - 4 + 3b - 5b - 2 + 3b) = 5b - (2b - 6) =
= 5b - 2b + 6 = 3b + 6
Szczegółowe wyjaśnienie: