There is a batch of cement that used (3/4) tons on the first day, (5/6) tons on the second day, and (3/8) tons less than the sum of the previous two days on the third day, and (3/8) tons on the third day. How many tons are used per day?
有一批水泥，第一天用去(3/4)吨，第二天用去(5/6)吨，第三天用去的比前两天的总和少(3/8)吨，第三天用去多少吨？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/6) - (3/8)</gadget>
<output>11/24 = around 0.458333</output>

<gadget id="calculator">(3/4) + (11/24)</gadget>
<output>29/24 = around 1.208333</output>

<result>29/24 = around 1.208333</result>