Question

помогите срочно !!!!!!!! -5/16•4/7-21/32:(-9/4)​

Answer 1

Ответ:

19/128.

Пошаговое объяснение:

Найдем значение данного выражения -5/16 * 4/7 - 21/32 : (-9/4) по действиям (сначала произведение и частное, затем разность):

1) -5/16 * 4/7 = -(5 * 4)/(16 * 7) = -(5 * 1)/(4 * 7) = -5/28;

2) 21/32 : (-9/4) = (заменим частное на произведение, перевернув вторую обыкновенную дробь) = 21/32 * (-4/9) = -(21 * 4)/(32 * 9) = -(7 * 1)/(8 * 3) = -7/24;

3) -5/28 - (-7/24) = -5/28 + 7/24 = (приведем обыкновенные дроби к общему знаменателю 168) = -30/128 + 49/128 = 19/128.

Ответ: 19/128.

Answer 2

Ответ 19/128
Всё правильно

Answer 3

-5/16 • 4/7 - 21/32 : (-9/4)

First, we need to simplify the division by a fraction. This can be done by multiplying by the reciprocal of the fraction:

-5/16 • 4/7 - 21/32 • (-4/9)

Next, we can simplify the fractions:

-5/4 • 2/7 - 21/8 • (-4/9)

Now we can multiply the fractions:

-10/28 + 84/72

To add or subtract fractions, we need a common denominator:

-10/28 + 84/72 = -90/2520 + 294/2520

Now we can add the fractions:

-90/2520 + 294/2520 = 204/2520

Finally, we can simplify the fraction by dividing both the numerator and denominator by their greatest common factor, which is 12:

204/2520 = 17/210

Therefore, -5/16 • 4/7 - 21/32 : (-9/4) simplifies to 17/210.