Calculation: ((1/2)+(2/3)+(3/4)+…+(9/10))**2+((1/2)+(2/3)+(3/4 )+…+(9/10))*(1/2)-(1+(1/2)+(2/3)+…+(9/10))*((2/3)+(3 /4)+…+(9/10))=
计算：((1/2)+(2/3)+(3/4)+…+(9/10))**2+((1/2)+(2/3)+(3/4)+…+(9/10))*(1/2)-(1+(1/2)+(2/3)+…+(9/10))*((2/3)+(3/4)+…+(9/10))=
<result>0</result>