In the sentence "the water consumption of this month is saved (1/10) compared with that of last month", the unit is "1", and the water consumption of this month is ((())/(())) of last month.
"本月用水量比上月节约了(1/10)"这句话中多少是单位"1"，本月用水量是上月的((())/(()))．
<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>

<result>9/10 = around 0.9</result>