8.4*1.8+8.4*8.1+0.84．
8.4*1.8+8.4*8.1+0.84．
<gadget id="calculator">8.4 * 1.8</gadget>
<output>15.12</output>

<gadget id="calculator">8.4 * 8.1</gadget>
<output>68.04</output>

<gadget id="calculator">15.12 + 68.04 + 0.84</gadget>
<output>84</output>

<result>84</result>