14-13,2:(3 11/21-2 4/15)

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вопрос

To add the fractions 3 11/21 and 2 4/15, we first need to convert them to improper fractions.

3 11/21 = (3 21 + 11)/21 = 64/21
2 4/15 = (2 15 + 4)/15 = 34/15

To add these two fractions, we need to find a common denominator, which in this case is 105 (since 21 and 15 both go into 105).

64/21 = (64 5)/(21 5) = 320/105
34/15 = (34 7)/(15 7) = 238/105

Now, we can add these two fractions together:

320/105 + 238/105 = (320 + 238)/105 = 558/105

Finally, we can simplify this fraction by dividing both the numerator and denominator by their greatest common divisor, which is 3:

558/105 = (558 ÷ 3) / (105 ÷ 3) = 186/35

Therefore, 3 11/21 + 2 4/15 = 14 13/35.