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![](https://rs.olm.vn/images/avt/0.png?1311)
\(b>\frac{-5}{16}=\frac{-5}{8}:2\)\(a>\frac{-5}{16}=-5.\frac{1}{16}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{-7}{20}=\dfrac{1}{5}.\dfrac{-7}{4}\) b) \(\dfrac{-7}{20}=\dfrac{-7}{40}:\dfrac{1}{2}\) c) \(\dfrac{-7}{20}=\dfrac{2}{5}+\dfrac{-3}{4}\) d) \(\dfrac{-7}{20}=\dfrac{-1}{5}+\dfrac{-3}{20}\)
a)\(\dfrac{-7}{20}=\dfrac{-7}{10}\times\dfrac{1}{2}\)
b)\(\dfrac{-7}{20}=\dfrac{-7}{40}\times\dfrac{1}{2}\)
c)\(\dfrac{-7}{20}=\dfrac{7}{20}+\dfrac{-7}{10}\)
d)\(\dfrac{-7}{20}=\dfrac{-1}{5}+\dfrac{-3}{20}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
Ta có:
\(\dfrac{-8}{14}=\dfrac{-4}{7}\): \(\dfrac{2}{27}=\dfrac{2}{27}\) : \(\dfrac{12}{-21}=\dfrac{4}{-7}=\dfrac{-4}{7}\) : \(\dfrac{-36}{63}=\dfrac{-4}{7}\) : \(\dfrac{-12}{-54}=\dfrac{-2}{-9}=\dfrac{2}{9}\) : \(\dfrac{-16}{27}=\dfrac{-16}{27}\)
Vậy trong các phân số trên, các phân số: \(\dfrac{-8}{14};\dfrac{12}{-21};\dfrac{-36}{63}\) biểu diễn cùng 1 số hữu tỉ.
b) Ta có : \(-0,75=\dfrac{-3}{4}\)
\(\Rightarrow3\) phân số cùng biểu diễn số hữu tỉ trên là: \(\dfrac{-6}{8};\dfrac{-9}{12};\dfrac{-12}{16}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Vd 3:
a) 9/10 > 5/42 b) -4/27 < 10/-73
Vd 4:
5/-6: -7/12; 5/8; 3/4
Vd 5:
x<y
Vd 6:
-16/27= -16/27> -16/29
Mỗi câu có nhiều đáp án, chẳng hạn:
a)
= ![This is the rendered form of the equation. You can not edit this directly. Right click will give you the option to save the image, and in most browsers you can drag the image onto your desktop or another program.](http://latex.codecogs.com/gif.latex?%5Cfrac%7B-5%7D%7B4%7D.%20%5Cfrac%7B1%7D%7B4%7D%20%3D%20%5Cfrac%7B-5%7D%7B8%7D%20.%20%5Cfrac%7B1%7D%7B2%7D%20%3D%20%5Cfrac%7B-10%7D%7B2%7D%20.%20%5Cfrac%7B1%7D%7B16%7D%3D%20...)
b)![This is the rendered form of the equation. You can not edit this directly. Right click will give you the option to save the image, and in most browsers you can drag the image onto your desktop or another program.](http://latex.codecogs.com/gif.latex?%5Cfrac%7B-5%7D%7B16%7D%20%3D%20%5Cfrac%7B-5%7D%7B8%7D%20%3A%202%20%3D%20%5Cfrac%7B-5%7D%7B4%7D%20%3A%204%20%3D%20....)
Lời giải:
Mỗi câu có nhiều đáp án, chẳng hạn:
a)
= ![This is the rendered form of the equation. You can not edit this directly. Right click will give you the option to save the image, and in most browsers you can drag the image onto your desktop or another program.](http://latex.codecogs.com/gif.latex?%5Cfrac%7B-5%7D%7B4%7D.%20%5Cfrac%7B1%7D%7B4%7D%20%3D%20%5Cfrac%7B-5%7D%7B8%7D%20.%20%5Cfrac%7B1%7D%7B2%7D%20%3D%20%5Cfrac%7B-10%7D%7B2%7D%20.%20%5Cfrac%7B1%7D%7B16%7D%3D%20...)
b)![This is the rendered form of the equation. You can not edit this directly. Right click will give you the option to save the image, and in most browsers you can drag the image onto your desktop or another program.](http://latex.codecogs.com/gif.latex?%5Cfrac%7B-5%7D%7B16%7D%20%3D%20%5Cfrac%7B-5%7D%7B8%7D%20%3A%202%20%3D%20%5Cfrac%7B-5%7D%7B4%7D%20%3A%204%20%3D%20....)