Наталия Бельская
Оракул
(57591)
6 лет назад
1) 1 - 3\x = (x-3)\x
(6x-9)\x - x = (6x-9-x^2)\x = (-1) * (x^2-6x+9)\x = (-1) * (x-3)^2 \ x
=>
(x-3)\x \ [(-1)(x-3)^2\x] = (x-3)\x * x\(-1)(x-3)^2 = (x-3)\-(x-3)^2 * x\x = 1\(3-x)
2) 1 - 1\(1+a) = [(1+a) - 1]\(1+a) = a\(1+a)
1 - 1\{1 - 1\(1+a)} = 1 - 1\[a\(1+a)] = 1 - (1+a)\a = [a - (1+a)]\a = -1\a
1 \ [1 - 1\{1 - 1\(1+a)}] = 1 \ (-1\a) = -a