Calculation: (1/(3+6))+(1/(3+6+9))+(1/(3+6+9+12))+…+(1/(3+6+9+ 12+...+150))= how much.
计算：(1/(3+6))+(1/(3+6+9))+(1/(3+6+9+12))+…+(1/(3+6+9+12+…+150))=多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 51</gadget>
<output>1/51 = around 0.019608</output>

<gadget id="calculator">(1/2) - (1/51)</gadget>
<output>49/102 = around 0.480392</output>

<gadget id="calculator">(2/3) * (49/102)</gadget>
<output>49/153 = around 0.320261</output>

<result>49/153 = around 0.320261</result>