Calculate with a simple method: 314*0.043+3.14*7.2-31.4*0.15.
用简便方法计算：314*0.043+3.14*7.2-31.4*0.15．
<gadget id="calculator">314 * 0.043</gadget>
<output>13.502</output>

<gadget id="calculator">3.14 * 7.2</gadget>
<output>22.608</output>

<gadget id="calculator">31.4 * 0.15</gadget>
<output>4.71</output>

<gadget id="calculator">22.608 - 4.71</gadget>
<output>17.898</output>

<gadget id="calculator">13.502 + 17.898</gadget>
<output>31.4</output>

<result>31.4</result>