Question

Тема Умножение дробей .Математика

Найдите произведение :
а)9/10•7/8•5/6
б)3/25•5/6•10/9
в)3/8•2/15•20/72
г)17/13•26/51•8/9
д)8•9/16•7/12
е)4/9•9/8•10/17
ж)9/20•5/8•4/15
з)11/36•2/55•18
и)21/22•12•33/56

Answer 1

Ответ:

а)

$\frac{9}{10} \times \frac{5}{6} = \frac{3}{4} \times \frac{7}{8} = \frac{21}{32}$

Б)

$\frac{3}{25} \times \frac{5}{6} \times \frac{20}{72} = \frac{1}{36} \\ \frac{3}{25} \times \frac{5}{6} = \frac{1}{10} \times \frac{20}{72} = \frac{2}{72} = \frac{1}{36}$

В)

$\frac{3}{8} \times \frac{2}{15} \times \frac{20}{72} = \frac{1}{72} \\ \frac{3}{8} \times \frac{2}{15} = \frac{1}{20} \times \frac{20}{72} = \frac{1}{72}$

Г)

$\frac{17}{13} \times \frac{26}{51} \times \frac{8}{9} = \frac{16}{27} \\ \frac{17}{13} \times \frac{26}{51} = \frac{2}{3} \times \frac{8}{9} = \frac{16}{27}$

Д)

$8 \times \frac{9}{16} \times \frac{7}{12} =2 \frac{5}{8} \\ 8 \times \frac{9}{16} = \frac{9}{2} \times \frac{7}{12} = \frac{21}{8} = 2 \frac{5}{8}$

Е)

$\frac{4}{9} \times \frac{9}{8} \times \frac{10}{17} = \frac{5}{17} \\ \frac{4}{9} \times \frac{9}{8} = \frac{1}{2} \times \frac{10}{17} = \frac{5}{17}$

Ж)

$\frac{9}{20} \times \frac{5}{8} \times \frac{4}{15} = \frac{3}{40} \\ \frac{9}{20} \times \frac{5}{8} = \frac{9}{32} \times \frac{4}{15} = \frac{3}{40}$

З)

$\frac{11}{36} \times \frac{2}{55} \times 18 = \frac{1}{5} \\ \frac{11}{36} \times \frac{2}{55} = \frac{1}{90} \times 18 = \frac{1}{5}$

И)

$\frac{21}{22} \times 12 \times \frac{33}{56} = 6 \frac{3}{4} \\ \frac{21}{22} \times 12 = \frac{126}{11} \times \frac{33}{56} = \frac{27}{4} = 6 \frac{3}{4}$