HÃY sắp xếp các phân số sau theo thứ tự từ bé đến lớn 1/12, 2/5, 2/3, 3/4, 5/6

2 câu trả lời

Quy đồng mẫu số các phân số ta có :

$\dfrac{1}{{12}} = \dfrac{{1 \times 5}}{{12 \times 5}} = \dfrac{5}{{60}} \,\,\,\, ; \dfrac{2}{5} = \dfrac{{2 \times 12}}{{5 \times 12}} = \dfrac{{24}}{{60}}$

\(\dfrac{2}{3} = \dfrac{{2 \times 20}}{{3 \times 20}} = \dfrac{{40}}{{60}} \,\,\,\, ; \dfrac{3}{4} = \dfrac{{3 \times 15}}{{4 \times 15}} = \dfrac{{45}}{{60}}\, \)

\(\dfrac{5}{6} = \dfrac{{5 \times 10}}{{6 \times 10}} = \dfrac{{50}}{{50}}\)

Lại có : \(\dfrac{5}{{60}} < \dfrac{{24}}{{60}} < \dfrac{{40}}{{60}} < \dfrac{{45}}{{60}} < \dfrac{{50}}{{60}}\)

Do đó : \(\dfrac{1}{{12}} < \dfrac{2}{5} < \dfrac{2}{3} < \dfrac{3}{4} < \dfrac{4}{6}\)

Vậy các phân số xếp theo thứ tự từ bé đến lớn là : \(\dfrac{1}{{12}};\,\,\,\dfrac{2}{5};\,\,\,\dfrac{2}{3};\,\,\,\dfrac{3}{4};\,\,\,\dfrac{4}{6}\)

Đáp án: ` 1/12 < 2/5 < 2/3 < 3/4 < 5/6`

 

Giải thích các bước giải:

`1/12 = 5/60`

`2/5=24/60`

`2/3=40/60`

`3/4=45/60`

`5/6=50/60`

`=> 5/60<24/60<40/60<45/60<50/60`

`=> 1/12 < 2/5 < 2/3 < 3/4 < 5/6`

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This is John . He’s a teacher. He’s old and a little fat. He has short black hair. He works at the school. He teaches English. Every day he gets up at half past six in the morning. He takes a shower and puts on a shirt and tie. Then he eats breakfast at seven o’clock. At half past seven, he rides his motorcycle to school. Tony starts work at eight o’clock. He cleans the classroom. Then, he talks with his students’ parents. He starts teaching at nine o’clock. At twelve o’clock, he eats lunch. He teaches again in the afternoon. He goes home at half past four. In the evening, he feeds his goldfish and he watches TV. He eats dinner at half past six. Then he corrects students’ homework. At ten o’clock, he goes to bed. 1. What’s his name? …………………………………………………………………….. 2. What does he look like ? …………………………………………………………………….. 3. What time does he get up ? …………………………………………………………………….. 4. What time does he eat breakfast ? …………………………………………………………………….. 5. What time does he go home ? …………………………………………………………………….. 6. What time does he eat dinner? …………………………………………………………………….. 7. What time does he go to bed? …………………………………………………………………….. 8. What does he do in the evening ? ……………………………………………………………………..

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