Пошаговое объяснение:
Нам нужно решить уравнение (2,5y - 4)(6y + 1,8) = 0.
Для этого мы рассмотрим и проанализируем заданное уравнение.
Наше уравнение представляет собой равенство в правой части которой стоит ноль, а в левой произведение двух скобок.
Известно, что произведение равно нулю, когда хотя бы один из множителей равен нулю.
Чтобы найти все корни уравнения приравняем каждый из множителей к нулю и решим полученные уравнения.
1) 2.5y - 4 = 0;
2.5y = 4;
y = 4 : 2.5;
y = 1.6;
2) 6y + 1.8 = 0;
6y = -1.8;
y = -1.8 : 6;
y = -0.3.
ответ: y = 1.6; y = -0.3.
Пошаговое объяснение:
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1 костюм - 5 м
На ск. метров материя 3 костюмов меньше 6 рубашек-?
Решение:
3*3=9 (метров на 3 костюма)
3м 50см = 3 м 5 дм = 3,5 м
3,5*6=21 (метров на 6 рубашек)
21-9=12
ответ: на 12 метров меньше