If the numerator of a fraction remains unchanged and the denominator is enlarged by 10 times, the difference between the obtained fraction and the original fraction is (27/70), what is the original fraction?
一个分数的分子不变，分母扩大10倍，所得到的分数与原来的分数的差是(27/70)，那么原来的分数是多少．
<gadget id="calculator">27 / 70</gadget>
<output>27/70 = around 0.385714</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(27/70) / (9/10)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>