=(1+2+3+…+10)+(1/6+1/12+…+1/110)
=(1+10)*11/2+(1/2*3+1/3*4+1/4*5+…1/10*11)
=55+(1/2-1/3+1/3-1/4+1/4-…+1/10-1/11)
=55+(1/2-1/11)
=55+9/22
=55又9/22