(1/(1*2))=(1/1)-(1/2), (1/(2*3))=(1/2)-(1/3), (1/(3* 4))=(1/3)-(1/4)…According to the law, calculate the value of (1/2)+(1/6)+(1/12)+…+(1/90).
(1/(1*2))=(1/1)-(1/2)，(1/(2*3))=(1/2)-(1/3)，(1/(3*4))=(1/3)-(1/4)…按照规律，求(1/2)+(1/6)+(1/12)+…+(1/90)的值．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>