A piece of iron sheet (7/8) square meters, cut off (1/2) of this sheet of iron sheet for the first time, and cut off (1/4) of this sheet of iron sheet for the second time, leaving a fraction of this sheet of iron sheet Several?
一张铁皮(7/8)平方米，第一次剪去这块铁皮的(1/2)，第二次剪去这块铁皮的(1/4)，还剩这块铁皮的几分之几？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/2) + (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>