Question

21/80:4/15.................. ​

Answer 1

Решение:

21/80 : 4/15 = 21/80 * 15/4 (чтобы разделить на дробь, нужно умножить на перевёрнутую дробь)

21/80 * 15/4 = 21/16 * 3/4 (сократили 80 и 15 на 5)

21/16 * 3/4 = 63/64.

Ответ: 63/64.

Answer 2

To simplify the expression 21/80 ÷ 4/15, you can follow these steps:

1. Invert the second fraction (4/15) to find its reciprocal: 15/4.
2. Then, multiply the two fractions together:

(21/80) * (15/4)

To multiply fractions, simply multiply the numerators (top numbers) together and the denominators (bottom numbers) together:

(21 * 15) / (80 * 4)

3. Calculate the products:

315 / 320

4. Simplify the fraction by finding the greatest common divisor (GCD) of the numerator and denominator, which is 5:

(315 ÷ 5) / (320 ÷ 5)

63/64

So, 21/80 ÷ 4/15 simplifies to 63/64.