Question

111&!!!СРОООЧНО!!!&111​

Answer 1

Ответ:

$1) \frac{7}{15} + \frac{3}{10} = \frac{14 + 9}{30} = \frac{23}{30} \\ \\ 2) \frac{30}{57} - \frac{3}{19} = \frac{30 - 9}{57} = \frac{21}{57} = \frac{7}{19} \\ \\ 3) \frac{23}{30} \times 2 \frac{14}{23} = \frac{23 \times 60}{30 \times 23} = 2 \\ \\ 4)1 \frac{6}{57} \div \frac{7}{19} = \frac{63 \times 19}{57 \times 7} = \frac{9}{3} = 3 \\ \\ 5)2 + 3 = 5$

Answer 2

Ответ:

1) (7/15 + 3/10) = (14/30 + 9/30) = 23/30

2) 30/57 - 3/19 = 30/57 - 9/57 = 21/57

3) 23/30 * 60/23= 2

4) 63/57 : 21/57 = 3

5) 2 + 3 = 5