Given that a=3 and b=0.2, what is the value of 2a-b**2?
已知a=3，b=0.2，则2a-b**2的值是多少．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">0.2 ** 2</gadget>
<output>0.04</output>

<gadget id="calculator">6 - 0.04</gadget>
<output>5.96</output>

<result>5.96</result>