Question

2 1/7*31/9 3/7*7/9
5/8* 1 13/15*2 2/7
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Answer 1

Пошаговое объяснение:

$2 \frac{1}{7} \times \frac{31}{9} = \frac{15}{7} \times \frac{31}{9} = \frac{5}{7} \times \frac{31}{3} = \frac{155}{21} = 7 \frac{8}{21}$

$\frac{3}{7 } \times \frac{7}{9} = \frac{1}{3}$

$\frac{5}{8} \times 1 \frac{13}{15} \times 2 \frac{2}{7} = \frac{1}{4} \times \frac{13}{3} \times \frac{2}{7} = \frac{1}{2} \times \frac{13}{3} \times \frac{1}{7} = \frac{1 \times 13 \times 1}{2 \times 3 \times 7} = \frac{13}{42}$