Question

Помогите пожалуйста
А
Б
В
Г
Д
Е
Ж
З

Answer 1

а)

$\frac{3}{4} ( \times 2) + \frac{1}{8} = \frac{6}{8} + \frac{1}{8} = \frac{7}{8}$

б)

$\frac{11}{15} ( \times 4)- \frac{7}{20}( \times 3) = \frac{44}{60} - \frac{21}{60} = \frac{23}{60}$

в)

$\frac{5}{4} \times \frac{2}{3} = \frac{5 \times 1}{2 \times 3} = \frac{5}{6}$

г)

$\frac{3}{20} \div \frac{9}{10} = \frac{3}{20} \times \frac{10}{9} = \frac{1 \times 1}{2 \times 3} = \frac{1}{6}$

д)

$2 \frac{2}{5} + 3 \frac{1}{6} = \\ (2 + 3) + ( \frac{2}{5}( \times 6) + \frac{1}{6} ( \times 5))= \\ 5 + ( \frac{12}{30} + \frac{5}{30} ) = 5 \frac{17}{30}$

е)

$5 \frac{2}{3} - 2 \frac{3}{4} = \\ (5 - 2) + ( \frac{2}{3} ( \times 4) - \frac{3}{4} ( \times 3)) = \\ 3 + ( \frac{8}{12} - \frac{9}{12} ) = 3 - \frac{1}{12} = \\ 2 \frac{12}{12} - \frac{1}{12} = 2 \frac{11}{12}$

ж)

$4 \frac{2}{15} \times 5 = \frac{62}{15} \times \frac{5}{1} = \frac{62 \times 1}{3 \times 1} = \frac{62}{3} = 20\frac{2}{3}$

з)

$7 \frac{3}{5} \div 19 = \frac{38}{5} \times \frac{1}{19} = \frac{2 \times 1}{5 \times 1} = \frac{2}{5}$