When a=3.5, b=2, c=5, then how much is 2a-3b+bc=.
当a=3.5，b=2，c=5时，那么2a-3b+bc=多少．
<gadget id="calculator">2 * 3.5</gadget>
<output>7</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">7 - 6</gadget>
<output>1</output>

<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">1 + 10</gadget>
<output>11</output>

<result>11</result>