The rainfall in a certain place this year is 500 milliliters, which is less than last year (5/7). How many milliliters was the rainfall last year?
某地今年的降雨量500亳升，比去年减少(5/7)去年的降雨量是多少毫升？
<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">500 / (2/7)</gadget>
<output>1_750</output>

<result>1_750</result>