An iron wire is (7/8) meters long, divide it into 7 parts on average, each part is ((())/(())) of this iron wire, how many meters is one part long.
一根铁丝长(7/8)米，把它平均分成7份，每份是这根铁丝的((())/(()))，1份长多少米．
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(7/8) * (1/7)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>