(5/7)+(1/4)-(9/14)=how much.
(5/7)+(1/4)-(9/14)=多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

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

<gadget id="calculator">9 / 14</gadget>
<output>9/14 = around 0.642857</output>

<gadget id="calculator">(1/4) - (9/14)</gadget>
<output>-11/28 = around -0.392857</output>

<gadget id="calculator">(5/7) + (-11/28)</gadget>
<output>9/28 = around 0.321429</output>

<result>9/28 = around 0.321429</result>