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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1м ³ = 10 дм * 10 дм * 10 дм = 1000 дм³
1дм³ = 1 литр
15 м³ * 1000 = 15 000 литров = 15 т - объем воды
5 * 1.5 * 2 + 2 * 1.5 * 2 = 15 + 6 = 21 м² площадь поверхности ,которую надо покрасить.
21 * 800 = 16800 г = 16,.8 кг краски необходимо
16.8 \ 3 = 5.6 банки = 6 банок понадобится ( ответ приблизительный)
800 * 6 = 4800 рублей - стоят 6 банок краски