untitled

$$\frac{1}{2}$$  

$$\frac{1}{3}$$  

$$\frac{3}{9}$$  

$$\frac{3}{9}$$  

$$\frac{1}{2}=-\frac{-10}{-20}$$  

$$\frac{1}{2}=\frac{5}{-10}$$  

$$\frac{-5}{-10}=\frac{1}{2}$$  

$$\frac{1}{2}=\frac{-3}{6}$$  

20

-20

25

-25

$$\frac{22}{23}$$  

$$\frac{23}{22}$$  

$$\frac{22}{45}$$  

$$\frac{45}{22}$$  

$$\frac{32}{72}\$$  và  $$\frac{40}{72}$$  

$$\frac{32}{72}$$  và  $$\frac{45}{72}$$  

$$\frac{20}{45}$$  và  $$\frac{20}{32}$$  

$$\frac{32}{45}\$$  và  $$\frac{45}{72}$$  

$\frac{5}{3}$

$\frac{3}{5}$

$\frac{5}{8}$

$\frac{3}{8}$

1

4

9

36

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=

-

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=

+

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