Simple operation: 49*(3/5)+(3/5).
简便运算：49*(3/5)+(3/5)．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">49 * (3/5)</gadget>
<output>147/5 = around 29.4</output>

<gadget id="calculator">(147/5) + (3/5)</gadget>
<output>30</output>

<result>30</result>