Question

помогите пж
Виконати завдання з файлів №673,674,678

Answer 1

Ответ:

№673

а) 5/6.

б) 3.

в) 3 1/5.

г) 1/192

д) 1 1/5

№674

а) 6 2/3

б) 1 1/2

в) 13/15

г) 2/3

д) 6

№678

а) 1 1/8

б) 1

в) 3/2

г) 6/7

Answer 2

Ответ:

Номер 673

а)

$\frac{5}{8} \div \frac{3}{4} = \frac{5}{8} \times \frac{4}{3} = \frac{5}{6}$

б)

$\frac{8}{9} \div \frac{8}{27} = \frac{8}{9} \times \frac{27}{8} = 3$

в)

$\frac{12}{25} \div \frac{3}{20} = \frac{12}{25} \times \frac{20}{3} = \frac{4}{5} \times \\ \times \frac{4}{1} = \frac{16}{5}$

г)

$\frac{5}{32} \div 30 = \frac{5}{32} \div \frac{30}{1} = \frac{5}{32} \times \\ \times \frac{1}{30} = \frac{1}{192}$

д)

$\frac{21}{32} \div \frac{35}{64} = \frac{21}{32} \times \frac{64}{35} = \frac{42}{35}$

Номер 674

а)

$5 \frac{1}{3} \div \frac{4}{5} = \frac{16}{3} \div \frac{4}{5} = \frac{16}{3} \times \\ \times \frac{5}{4} = \frac{80}{12} = \frac{4 \times 20}{4 \times 3} = \frac{20}{3}$

б)

$2 \div 1 \frac{1}{3} = \frac{2}{1} \div \frac{4}{3} = \frac{2}{1} \times \frac{3}{4} = \\ = \frac{3}{2}$

в)

$3 \frac{7}{15} \div 4 = \frac{52}{15} \div \frac{4}{1} = \frac{52}{15} \times \\ \times \frac{1}{4} = \frac{13}{15}$

г)

$\frac{8}{11} \div 1 \frac{1}{11} = \frac{8}{11} \div \frac{12}{11} = \\ = \frac{8}{11} \times \frac{11}{12} = \frac{8}{12} = \\ = \frac{4 \times 2}{4 \times 3} = \frac{2}{3}$

д)

$7 \frac{1}{3} \div 1 \frac{2}{9} = \frac{22}{3} \div \frac{11}{9} = \\ = \frac{22}{3} \times \frac{9}{11} = \\ = 2 \times 3 = 6$

Номер 678

а)

$\frac{2}{3} x = \frac{3}{4}$

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

$x = \frac{3}{4} \times \frac{3}{2}$

$x = \frac{3 \times 3}{4 \times 2}$

$x = \frac{9}{8}$

б)

$x \times \frac{2}{7} = \frac{2}{7}$

$x = \frac{2}{7} \div \frac{2}{7}$

$x = \frac{2}{7} \times \frac{7}{2}$

$x = \frac{2 \times 7}{7 \times 2}$

$x = \frac{14}{14}$

$x = 1$

в)

$3 \frac{1}{3} x = 5$

$\frac{10}{3} x = 5$

$x = 5 \div \frac{10}{3}$

$x = \frac{5}{1} \div \frac{10}{3}$

$x = \frac{5}{1} \times \frac{3}{10}$

$x = \frac{5 \times 3}{1 \times 10}$

$x = \frac{15}{10}$

$x = \frac{5 \times 3}{5 \times 2}$

$x = \frac{3}{2}$

г)

$2 \frac{2}{5} x = 3 \frac{3}{7}$

$\frac{12}{5} x = \frac{24}{7}$

$x = \frac{24}{7} \div \frac{12}{5}$

$x = \frac{24}{7} \times \frac{5}{12}$

$x = \frac{2}{7} \times \frac{5}{1}$

$x = \frac{2 \times 5}{7 \times 1}$

$x = \frac{10}{7}$