1/2+1/6+1/12+1/30+1/42+1/56=?

1/2+1/6+1/12+1/20+1/30+1/42+1/56=? 2/1+6/1+12/1+20/1+30/1+42/1+56/1= 2/1+6/1+12/1+20/1+30/1+42/1+56/1=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56= 1/2+1/6+1/12+1/30+1/42+1/56=() 1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+.1/132= 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+190+1/110=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90= 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=多少 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=______ 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+.1/9900=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72