1*2+2*3+3*4+...+99*100.
1*2+2*3+3*4+…+99*100．
<gadget id="calculator">99 + 1</gadget>
<output>100</output>

<gadget id="calculator">2 * 99</gadget>
<output>198</output>

<gadget id="calculator">198 + 1</gadget>
<output>199</output>

<gadget id="calculator">199 / 6</gadget>
<output>199/6 = around 33.166667</output>

<gadget id="calculator">99 * 100 * (199/6)</gadget>
<output>328_350</output>

<gadget id="calculator">1 + 99</gadget>
<output>100</output>

<gadget id="calculator">99 / 2</gadget>
<output>99/2 = around 49.5</output>

<gadget id="calculator">100 * (99/2)</gadget>
<output>4_950</output>

<gadget id="calculator">328_350 + 4_950</gadget>
<output>333_300</output>

<result>333_300</result>