Calculate (((1/1)+(1/3))/((1/1)*(1/2)*(1/3)))+(((1/2)+(1/4) )/((1/2)*(1/3)*(1/4)))+(((1/3)+(1/5))/((1/3)*(1/4) *(1/5)))+…+(((1/19)+(1/21))/((1/19)*(1/20)*(1/21)))=how much.
计算(((1/1)+(1/3))/((1/1)*(1/2)*(1/3)))+(((1/2)+(1/4))/((1/2)*(1/3)*(1/4)))+(((1/3)+(1/5))/((1/3)*(1/4)*(1/5)))+…+(((1/19)+(1/21))/((1/19)*(1/20)*(1/21)))=多少．
<result>5_738</result>