Плиз,(87-х•9)•40=960.срочно!
(87 - 9х) * 40 = 960 87 - 9х = 960 : 40 87 - 9х = 24 9х = 87 - 24 9х = 63 х = 63 : 9 х = 7 Проверка: (87 - 9 * 7) * 40 = 960 (87 - 63) * 40 = 960 24 * 40 = 960 960 = 960