When a=3, b=1.5, how much is 5.2a-3b=.
当a=3，b=1.5时，5.2a-3b=多少．
<gadget id="calculator">5.2 * 3</gadget>
<output>15.6</output>

<gadget id="calculator">3 * 1.5</gadget>
<output>4.5</output>

<gadget id="calculator">15.6 - 4.5</gadget>
<output>11.1</output>

<result>11.1</result>