The power consumption of this month is saved (1/8) compared with the previous month, and the power consumption of this month is the amount of the previous month.
本月用电量比上月节约(1/8)，本月用电量是上月的多少．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>