Simple calculation: (5/4)*(1/7)+(3/4)*(5/7).
简算：(5/4)*(1/7)+(3/4)*(5/7)．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(5/4) * (1/7)</gadget>
<output>5/28 = around 0.178571</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(3/4) * (5/7)</gadget>
<output>15/28 = around 0.535714</output>

<gadget id="calculator">(5/28) + (15/28)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>