Question

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Answer 1

20 задание

1)

$\frac{2}{5} = \frac{4}{10} = 0.4$

$0.4 + 1.83 = 2.23$

2)

$\frac{3}{20} = \frac{15}{100} = 0.15$

$6.4 - 0.15 = 6.25$

3)

$\frac{3}{10} = 0.3$

$9.8 \times 0.3 = 2.94$

4)

$\frac{1}{100} = 0.01$

$7.2 \div 0.01 = 720$

21 задание

1)

$8.5 = \frac{85}{10} = \frac{17}{2}$

$\frac{17}{2} - \frac{1}{3} = \frac{51}{6} - \frac{2}{6} = \frac{49}{6}$

2)

$1.8 = \frac{18}{10} = \frac{9}{5}$

$4 \frac{1}{9} + \frac{9}{5} = 4 + \frac{1}{9} + \frac{9}{5} = 4 + \frac{5}{45} + \frac{81}{45} = 4 + \frac{86}{45} = 4 + 1 \frac{41}{45} = 5 \frac{41}{45}$

3)

$0.12 = \frac{12}{100} = \frac{3}{25}$

$\frac{1}{9} \times \frac{3}{25} = \frac{3}{225} = \frac{1}{75}$

4)

$0.6 = \frac{6}{10} = \frac{3}{5}$

$\frac{6}{7} \div \frac{3}{5} = \frac{6}{7} \times \frac{5}{3} = \frac{6 \times 5}{7 \times 3} = \frac{2 \times 5}{7} = \frac{10}{7}$