89 если полный ответ это книга 5 класс нужна вот 5) 2/3: 10 6) 4/5: 8 7) 5/6: 10 8) 3/7: 12 9) 4: 2/5 10) 21: 7/8 11) 25: 5/8 12) 8: 16/21 13) 1/8: 3/4 14) 1/2: 9 15) 2/5: 7 16) 3/4: 9/16

Ответ:

дэньчик4

07.10.2020 13:11

2/3:10=2/3*1/10=1/15
4/5:8=4/5*1/8=1/10
5/6:10=5/6*1/10=1/12
3/7:12=3/7*1/12=1/28
4:2/5=4*5/2=10
21:7/8=21*8/7=24
25:5/8=25*8/5=40
8:16/21=8*21/16=21/2=10 1/2=10,5
1/8:3/4=1/8*4/3=1/6
1/2:9=1/2*1/9=1/18
2/5:7=2/5*1/7=2/35
3/4:9/16=3/4*16/9=4/3=1 1/3

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Ответ:

колдун3

07.10.2020 13:11

$5) \frac{2}{3} \div 10 = \frac{2}{3} \div \frac{10}{1} = \frac{2}{3} \times \frac{1}{10} = \frac{2 \times 1}{3 \times 10} = \frac{1 \times 1}{3 \times 5} = \frac{1}{15}$

$6) \frac{4}{5} \div 8 = \frac{4}{5} \times \frac{1}{8} = \frac{4 \times 1}{5 \times 8} = \frac{1 \times 1}{5 \times 2} = \frac{1}{10}$

$7) \frac{5}{6} \div 10 = \frac{5}{6} \times \frac{1}{10} = \frac{5 \times 1}{6 \times 10} = \frac{1 \times 1}{6 \times 2} = \frac{1}{12}$

$8) \frac{3}{7} \div 12 = \frac{3}{7} \times \frac{1}{12} = \frac{3 \times 1}{7 \times 12} = \frac{1 \times 1}{7 \times 4} = \frac{1}{28}$

$9) 4 \div \frac{2}{5} = \frac{4}{1} \times \frac{5}{2} = \frac{4 \times 5}{1 \times 2} = \frac{2 \times 5}{1 \times 1} = \frac{10}{1} = 10$

$10)21 \div \frac{7}{8} = \frac{21}{1} \times \frac{8}{7} = \frac{21 \times 8}{1 \times 7} = \frac{3 \times 8}{1 \times 1} = \frac{24}{1} = 24$

$11)25 \div \frac{5}{8} = \frac{25}{1} \times \frac{8}{5} = \frac{25 \times 8}{1 \times 5} = \frac{5 \times 8}{1 \times 1} = \frac{40}{1} = 40$

$12)8 \div \frac{16}{21} = \frac{8}{1} \times \frac{21}{16} = \frac{8 \times 21}{1 \times 16} = \frac{1 \times 21}{1 \times 2} = \frac{21}{2} = 10 \frac{1}{2} = 10.5$

$13) \frac{1}{8} \div \frac{3}{4} = \frac{1}{8} \times \frac{4}{3} = \frac{1 \times 4}{8 \times 3} = \frac{1 \times 1}{2 \times 3} = \frac{1}{6}$

$14) \frac{1}{2} \div 9 = \frac{1}{2} \times \frac{1}{9} = \frac{1 \times 1}{2 \times 9} = \frac{1}{18}$

$15) \frac{2}{5} \div 7 = \frac{2}{5} \times \frac{1}{7} = \frac{2 \times 1}{5 \times 7} = \frac{2}{35}$

$16) \frac{3}{4} \div \frac{9}{16} = \frac{3}{4} \times \frac{16}{9} = \frac{3 \times 16}{4 \times 9} = \frac{1 \times 4}{1 \times 3} = \frac{4}{3} = 1 \frac{1}{3}$