When x=3Y=1, then 5x+2y=how much.
当x=3Y=1时，那么5x+2y=多少．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">15 + 2</gadget>
<output>17</output>

<result>17</result>