Calculation: 2.8*((1/7)+(3/28))
计算：2.8*((1/7)+(3/28))
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">3 / 28</gadget>
<output>3/28 = around 0.107143</output>

<gadget id="calculator">(1/7) + (3/28)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2.8 * (1/4)</gadget>
<output>0.7</output>

<result>0.7</result>