Question

(7 2/3 - 5 4/5) : 2,8

Answer 1

Ответ:

Пошаговое объяснение:

7 2/3-5 4/5=7 10/15-5 12/15=1 13/15

1 13/15:2,8=28/15*5/14=2/3

Answer 2

To solve the expression, let's first convert the mixed numbers into improper fractions:

7 2/3 = (7 * 3 + 2) / 3 = 23 / 3 5 4/5 = (5 * 5 + 4) / 5 = 29 / 5

Now, we can perform the subtraction:

(23 / 3 - 29 / 5)

To subtract fractions, they must have a common denominator. The common denominator for 3 and 5 is 3 * 5 = 15.

Now, we'll rewrite the fractions with the common denominator:

(23/3 * 5/5 - 29/5 * 3/3) = (115/15 - 87/15)

Now, subtract the numerators:

= (115 - 87) / 15 = 28 / 15

Now, let's divide this result by 2.8:

(28 / 15) ÷ 2.8

To divide by a decimal number like 2.8, we can multiply by its reciprocal (1/2.8):

(28 / 15) * (1 / 2.8)

Now, multiply the numerators and denominators:

= (28 * 1) / (15 * 2.8) = 28 / 42

To simplify the fraction, divide both the numerator and denominator by their greatest common divisor, which is 14:

= (28 ÷ 14) / (42 ÷ 14) = 2 / 3

So, the final result is 2/3.