а) 0.5 x (2a-4b)=a-2b
б) -2 x (1,5c-6)+7-3с=-3c+12+7-3с=19-6с
в) 2 x (4-a) + 8 x (b-1)=8-2a+8b-8=8b-2a
Объяснение:
Пусть х - количество рядов в синем зале, тогда (х + 2) - количество рядов в пурпурном зале, но в каждом ряду на 4 места меньше. Уравнение:
648/х - 640/(х+2) = 4
648 · (х + 2) - 640 · х = 4 · х · (х + 2)
648х + 1296 - 640х = 4х² + 8х
8х + 1296 = 4х² + 8х
1296 = 4х² + 8х - 8х
4х² = 1296
х² = 1296 : 4
х² = 324
х = √324
х = 18 - количество рядов в синем зале
18 + 2 = 20 - количество рядов в пурпурном зале
ответ: 18 рядов и 20 рядов.
Проверка:
640 : 20 = 32 - количество мест в одном ряду в пурпурном зале
648 : 18 = 36 - количество мест в одном ряду в синем зале
36 - 32 = 4 - на столько меньше мест в одном ряду пурпурного зала
ЖЕДАЛЙАШОВАПРЫГНРМ ВППЦКП
Объяснение:
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a) 0,5 * (2a - 4b) = 0,5 * 2a - 0,5 * 4b = a - 2b
б) - 2 * (1,5c - 6) + 7 - 3c = - 2 * 1,5c - 2 * (- 6) + 7 - 3c = - 3c + 12 + 7 - 3c =
= 19 - 6c
в) 2 * (4 - a) + 8 * (b - 1) = 8 - 2a + 8b - 8 = 8b - 2a