Question

Вычисли:
$2) \: \frac{80}{81} \div \frac{40}{63} \times \frac{27}{28} \div \frac{3}{20}$

$4) \: \frac{24}{37} \div \frac{27}{74} \div \frac{32}{45} \times \frac{14}{15}$
по действиям
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Answer 1

Ответ:

2) = 10; 4) = $2\frac{1}{3}$

Пошаговое объяснение:

2) $\frac{80}{81}$ ÷ $\frac{40}{63}$ = $\frac{80}{81}$ × $\frac{63}{40}$ = $\frac{2}{9}$ × $\frac{7}{1}$ = $\frac{14}{9}$

$\frac{14}{9}$ × $\frac{27}{28}$ = $\frac{1}{1}$ × $\frac{3}{2}$ = $\frac{3}{2}$

$\frac{3}{2}$ ÷ $\frac{3}{20}$ = $\frac{3}{2}$ × $\frac{20}{3}$ = $\frac{1}{1}$ × $\frac{10}{1}$ = 1 × 10 = 10

4) $\frac{24}{37}$ ÷ $\frac{27}{74}$ = $\frac{24}{37}$ × $\frac{74}{27}$ = $\frac{8}{1}$ × $\frac{2}{9}$ = $\frac{16}{9}$

$\frac{16}{9}$ ÷ $\frac{32}{45}$ = $\frac{16}{9}$ × $\frac{45}{32}$ = $\frac{1}{1}$ × $\frac{5}{2}$ = $\frac{5}{2}$

$\frac{5}{2}$ × $\frac{14}{15}$ = $\frac{1}{1}$ × $\frac{7}{3}$ = $\frac{7}{3}$ = $2\frac{1}{3}$