Question

допоможить будь ласка

Answer 1

1. В)

$\frac{18}{54} = \frac{1}{3}$

2. А)

45:5 = 9

9*4 = 36

$\frac{4}{5} = \frac{36}{45}$

3. В) 30

4. В)

$\frac{3}{60} = \frac{1}{20}$

5.

$\frac{1}{7} = \frac{2}{14} = \frac{3}{21} = \frac{4}{28}$

6.

$\frac{5}{10} = \frac{1}{2} \\ \frac{14}{63} = \frac{2}{9} \\ \frac{21}{98} = \frac{3}{14} \\ \frac{480}{640} = \frac{3}{4}$

7.

$0.4 = \frac{4}{10} = \frac{2}{5} \\ 0.68 = \frac{68}{100} = \frac{17}{25} \\ 0.456 = \frac{456}{1000} = \frac{57}{125} \\ 0.875 = \frac{875}{1000} = \frac{7}{8}$

8.

$\frac{7}{15} + \frac{2}{15} = \frac{7 + 2}{15} = \frac{9}{15} = \frac{3}{5} \\ \frac{37}{46} - \frac{21}{46} = \frac{16}{46} = \frac{8}{23} \\ 5 \frac{17}{36} + 3 \frac{7}{36} = 8 \frac{24}{36} = 8 \frac{2}{3} \\ 17 \frac{53}{63} - 9 \frac{32}{63} = 8 \frac{21}{63} = 8 \frac{1}{3}$

9.

$\frac{2}{9} + \frac{5}{6} = \frac{4 + 15}{18} = \frac{19}{18} = 1 \frac{1}{18} \\ \frac{7}{8} + \frac{5}{12} = \frac{21 + 10}{24} = \frac{31}{24} =1 \frac{7}{24} \\ \frac{5}{6} + \frac{7}{12} = \frac{10 + 7}{12} = \frac{17}{12} = 1 \frac{5}{12} \\ \frac{3}{26} + \frac{9}{13} = \frac{3 + 18}{26} = \frac{21}{26}$