1 - (1 - a) - (1 - b) = 1 - 1 + a - 1 + b = a + b - 1
при a = 7/15; b = 8/15
7/15 + 8/15 - 1 = 15/15 - 1 = 1 - 1 = 0
ответ: с) 0.
1 - (1 - a) - (1 - b) = 1 - 1 + a - 1 + b = a + b - 1
при a = 7/15; b = 8/15
7/15 + 8/15 - 1 = 15/15 - 1 = 1 - 1 = 0
ответ: с) 0.