7.22*7.8+7.8*2.78.
7.22*7.8+7.8*2.78．
<gadget id="calculator">7.22 * 7.8</gadget>
<output>56.316</output>

<gadget id="calculator">7.8 * 2.78</gadget>
<output>21.684</output>

<gadget id="calculator">56.316 + 21.684</gadget>
<output>78</output>

<result>78</result>