| Fill in the boxes: |
(a)  |
(b)  |
(c)  |
Answer:
(a) or 
or 
or 
\[\Rightarrow \] 
(b) or 
or 
or 
\[\therefore \,\,\,\,\frac{7}{10}-\frac{1}{5}=\frac{1}{2}\] (c) 
\[\therefore \,\,\,\,\frac{1}{2}-\frac{1}{3}=\frac{1}{6}\]
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