Calculation: (((2+3+4)/1)-((3+4+5)/2)+((4+5+6)/3)-((5+6+7)/4) +…+((10+11+12)/9)-((11+12+13)/10))/(1-(1/2)+(1/3)-(1/4)+… +(1/9)-(1/10)).
计算：(((2+3+4)/1)-((3+4+5)/2)+((4+5+6)/3)-((5+6+7)/4)+…+((10+11+12)/9)-((11+12+13)/10))/(1-(1/2)+(1/3)-(1/4)+…+(1/9)-(1/10))．
<result>6</result>