Question

13/22 * 11; 5 * 4/25; 17/60 * 1 11/34; 2 2/5 * 2 7/9 * 3/10. Поможіть будьласка

Answer 1

I:

$\frac{13}{22} \times 11 = \frac{143}{22} = \frac{13 \times 11}{2 \times 11} sokrashaem \: \: 11 = \frac{13}{2} = 6 \frac{1}{2}$

II:

$5 \times \frac{4}{25} = \frac{20}{25} = \frac{4 \times 5}{5 \times 5} = \frac{4}{5}$

III:

$\frac{17}{60} \times 1 \frac{11}{34} = \frac{17}{60} \times \frac{45}{34} = \frac{17 \times 45}{60 \times 34} = \frac{765}{2040} = \frac{3 \times 255}{8 \times 255} = \frac{3}{8}$

IV:

$2 \frac{2}{5} \times 2 \frac{7}{9} \times \frac{3}{10} = \frac{12}{5} \times \frac{25}{9} = \frac{12 \times 25}{5 \times 9} = \frac{300}{45} = \frac{20 \times 15}{3 \times 15} = \frac{20}{3} =6 \frac{2}{3} \times \frac{3}{10} = \frac{20}{3} \times \frac{3}{10} = \frac{20 \times 3}{3 \times 10} = \frac{60}{30} = 2$