При каком значении переменной
х значения выражений 5 – (х + 3) и
7 * (2х – 1) – 8 противоположны?
х значения выражений 5 – (х + 3) и
7 * (2х – 1) – 8 противоположны?
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Verified answer
5 - (x + 3) = - 7(2x - 1) + 85 - x - 3 = - 14x + 7 + 8
- x + 2 = - 14x + 15
- x + 14x = 15 - 2
13x = 13
x = 1
Проверка
5 - (1 + 3) = 5 - 4 = 1
7*(2 - 1) - 8 = 7 - 8 = - 1