其它
Express the recurring decimal~$0.2\dot{5}$~as a fraction. ． 
Overseas Competition->Knowledge Point->Calculation Modules->Decimals->Recurring Decimals
$$x=0.2\dot{5}$$,  $$100x=25. \dot{5}$$,  $$10x=2. \dot{5}$$,  $$90x=23$$,  $$x= \frac{23}{90}$$. 