Simple calculation and clever calculation: 23(12/13)*(4/7)ten(1/3)/(7/4)+4/(7/4).
简算与巧算：23(12/13)*(4/7)十(1/3)/(7/4)+4/(7/4)．
<gadget id="calculator">1_102 / 39</gadget>
<output>1_102/39 = around 28.25641</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(1_102/39) * (4/7)</gadget>
<output>4_408/273 = around 16.14652</output>

<result>4_408/273 = around 16.14652</result>