Calculate with your favorite method: (4/5)-(7/10)+(8/15).
用自己喜欢的方法计算：(4/5)-(7/10)+(8/15)．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(4/5) - (7/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(1/10) + (8/15)</gadget>
<output>19/30 = around 0.633333</output>

<result>19/30 = around 0.633333</result>