Дроби к наименьшему общему знаменателю 1/5 и 1/3, 5/6 и 3/18, 1/6 и 1/4, 3/4 и 2/9, 7/16 и 1/2, 5/12 и 3/10

shum2 shum2    3   16.09.2019 02:50    0

Ответы
murat200202 murat200202  07.10.2020 18:54
ответ:

Решение см в разделе "Пошаговое объяснение".

Пошаговое объяснение:

1. 1/5 и 1/3 :

НОК (5; 3) = 5 · 3 = 15

5 - простое число.

3 - простое число.

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15 - наименьший общий знаменатель.

\frac{1}{5} =\frac{1\cdot3}{5\cdot3} =\bold{\frac{3}{15}}; \:\:\:\:\: \frac{1}{3} = \frac{1\cdot5}{3\cdot5}=\bold{\frac{5}{15}}

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

2. 5/6 и 3/18 :

НОК (6; 18) = 3 · 3 · 2 = 18

6 = 3 · 2

18 = 3 · 3 · 2

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18 - наименьший общий знаменатель.

\frac{5}{6} =\frac{5\cdot3}{6\cdot3} = \bf \frac{15}{18} ; \:\:\:\:\: \bf \frac{3}{18}

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

3. 1/6 и 1/4 :

НОК (6; 4) = 2 · 3 · 2 = 12

6 = 3 · 2

4 = 2 · 2

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12 - наименьший общий знаменатель.

\frac{1}{6} =\frac{1\cdot2}{6\cdot2} =\bold{\frac{2}{12} }; \:\:\:\:\: \frac{1}{4} =\frac{1\cdot3}{4\cdot3} =\bf \frac{3}{12}

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

4. 3/4 и 2/9 :

НОК (4; 9) = 2 · 2 · 3 · 3 = 36

4 = 2 · 2

9 = 3 · 3

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36 - наименьший общий знаменатель.

\frac{3}{4} =\frac{3\cdot9}{4\cdot9}=\bold{\frac{27}{36}}; \:\:\:\:\: \frac{2}{9}=\frac{2\cdot4}{9\cdot4}=\bold{\frac{8}{36}}

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

5. 7/16 и 1/2 :

НОК (16; 2) = 2 · 2 · 2 · 2 = 16

16 = 2 · 2 · 2 · 2

2 - простое число.

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16 - наименьший общий знаменатель.

\bold{\frac{7}{16}}; \:\:\:\:\: \frac{1}{2}=\frac{1\cdot8}{2\cdot8}=\bf \frac{8}{16}

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

6. 5/12 и 3/10 :

НОК (12; 10) = 2 · 2 · 3 · 5 = 60

12 = 2 · 3 · 2

10 = 2 · 5

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60 - наименьший общий знаменатель.

\frac{5}{12}=\frac{5\cdot5}{12\cdot5}=\bold{\frac{25}{60}}; \:\:\:\:\:\frac{3}{10}=\frac{3\cdot6}{10\cdot6}=\bf \frac{18}{60}

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

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