Question

2целых 5/8×(5/7-3/5)-9: 2 целых 1/4 решите, умоляю

Answer 1

2 5/8×(5/7-3/5)-9:2 1/4=-3 7/10

5/7-3/5=(5*5-3*7)/35=4/35

2 5/8*4/35=21/8*4/35=3/10

8:2 1/4=9:9/4=4

3/10-4=3/10-3 10/10=-3 7/10

Answer 2

$2 \frac{5}{8} \times ( \frac{5}{7} - \frac{3}{5} ) - 9 \div 2 \frac{1}{4}$

решаем по действиям :

$1) \frac{5}{7} - \frac{3}{5} = \frac{25}{35} - \frac{21}{35} = \frac{4}{35}$

$2)9 \div 2 \frac{1}{4} = 9 \div \frac{9}{4} = 9 \times \frac{4}{9} = \frac{36}{9} = 4$

$3)2 \frac{5}{8} \times \frac{4}{35} = \frac{21}{8} \times \frac{4}{35} = \frac{84}{240} = \frac{3}{10}$

$4) \frac{3}{10} - 4 = \frac{3}{10} - \frac{40}{10} = - \frac{37}{10} = - 3 \frac{7}{10}$

$- 3 \frac{7}{10}$