A bamboo pole with a total length of 7 meters is inserted into the water, and the part above the water accounts for (5/7) of the total length. How many meters is the inserted underwater part?
一根全长7米的竹竿插入水中，露出水面的部分占全长的(5/7)．插入水下部分是几米？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 - (5/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">7 * (2/7)</gadget>
<output>2</output>

<result>2</result>