Question

Хелп!!!!!!!!!!!!!!!!!!!

Answer 1

214. Выразить в одинаковых долях:

1)

$\frac{4}{25} \: u \: \frac{9}{10}$

$\frac{4 \times 2}{25 \times 2} \: u \: \frac{9 \times 5}{10 \times 5}$

$\frac{8}{50} \: u \: \frac{45}{50}$

2)

$\frac{5}{6} \: u \: \frac{4}{9}$

$\frac{5 \times 3}{6 \times 3} \: u \: \frac{4 \times 2}{9 \times 2}$

$\frac{15}{18} \: u \: \frac{8}{18}$

3)

$\frac{3}{20} \: u \: \frac{2}{15}$

$\frac{3 \times 3}{20 \times 3} \: u \: \frac{2 \times 4}{15 \times 4}$

$\frac{9}{60} \: u \: \frac{8}{60}$

4)

$\frac{3}{4} \: u \: \frac{9}{10}$

$\frac{3 \times 5}{4 \times 5} \: u \: \frac{9 \times 2}{10 \times 2}$

$\frac{15}{20} \: u \: \frac{18}{20}$

215. Сократить дроби и привести их к общему знаменателю:

1)

$\frac{3}{9} = \frac{3 \div 3}{9 \div 3} = \frac{1}{3}$

$\frac{15}{25} = \frac{15 \div 5}{25 \div 5} = \frac{3}{5}$

$\frac{1}{3} \: u \: \frac{3}{5}$

$\frac{1 \times 5}{3 \times 5} \: u \: \frac{3 \times 3}{5 \times 3}$

$\frac{5}{15} \: u \: \frac{9}{15}$

2)

$\frac{4}{6} = \frac{4 \div 2}{6 \div 2} = \frac{2}{3}$

$\frac{6}{8} = \frac{6 \div 2}{8 \div 2} = \frac{3}{4}$

$\frac{2}{3} \: u \: \frac{3}{4}$

$\frac{2 \times 4}{3 \times 4} \: u \: \frac{3 \times 3}{4 \times 3}$

$\frac{8}{12} \: u \: \frac{9}{12}$

3)

$\frac{2}{4} = \frac{2 \div 2}{4 \div 2} = \frac{1}{2}$

$\frac{6}{9} = \frac{6 \div 3}{9 \div 3} = \frac{2}{3}$

$\frac{1}{2} \: u \: \frac{2}{3}$

$\frac{1 \times 3}{2 \times 3} \: u \: \frac{2 \times 2}{3 \times 2}$

$\frac{3}{6} \: u \: \frac{4}{6}$

4)

$\frac{21}{98} = \frac{21 \div 7}{98 \div 7} = \frac{3}{14}$

$\frac{20}{84} = \frac{20 \div 4}{84 \div 4} = \frac{5}{21}$

$\frac{3}{14} \: u \: \frac{5}{21}$

$\frac{3 \times 3}{14 \times 3} \: u \: \frac{5 \times 2}{21 \times 2}$

$\frac{9}{42} \:u \: \frac{10}{42}$