1/2+1/6+1/12+1/20+.1/110=?
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xK0C*P_uх5#=J`
.*q2[9^+V=\HRL;3!Nn=0^ɘ8v폋+~V4
1/2+1/6+1/12+1/20+.1/110=?
1/2+1/6+1/12+1/20+.1/110=?
1/2+1/6+1/12+1/20+.1/110=?
1/2+1/6+1/12+1/20+.1/110
=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+.+1/(10*11)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/10-1/11
=1-1/11
=10/11