Calculation: 1**2-2**2+3**2-4**2+5**2-6**2+...-100**2+101**2=how much.
计算：1**2-2**2+3**2-4**2+5**2-6**2+…-100**2+101**2=多少．
<gadget id="calculator">101 + 100</gadget>
<output>201</output>

<gadget id="calculator">1 + 201</gadget>
<output>202</output>

<gadget id="calculator">51 / 2</gadget>
<output>51/2 = around 25.5</output>

<gadget id="calculator">202 * (51/2)</gadget>
<output>5_151</output>

<result>5_151</result>