№13 4) (5 1/6-3, 25)*4/23; 2) (21, 3-18 3/4): 3, 4; / это дробь * это умнажение

4)  (5 1/6 - 3,25) * 4/23 = (31/6 - 13/4) * 4/23 = (62/12 -39/12) * 4/23 = 23/12 * 4/23 = 1/3
2)  (21,3 -18 3/4) / 3,4 = (213/10 -75/4 ) / 34/10 = (426/20 - 375/20) / 17/5 =51/20  / 17/5 = 3/4 = 0,75

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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