通分并比较大小
\( \frac {2}{9}\)和\( \frac {1}{6}\)              
\( \frac {4}{15}\)和\( \frac {7}{45}\)                   
\( \frac {5}{8}\)和\( \frac {7}{10}\)．

【考点】通分,分数大小的比较

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