(10-2/55*1)+(9-2/55*2)+(8-2/55*3)+...+(1-2/55*10)=
简便计算:1/55+2/55+3/55+4/55+5/55+6/55+7/55+8/55+9/55+10/55-11/1
(10-4/55*1)+(9-4/55*2)+(8-4/55*3)+...+(2-4/55*9)+(1-4/55*10)
(10-3/55×1)+(9-3/55×2)+(8-3/55×3)+……+(2-3/55×9)+(1-3/55×10)=
简便计算,(10-7/55*1)+(9-7/55*2)+(8-7/55*3)+...+(1-7/55*10)
(1/55+2/55+3/55+~+10/55)-(11/155+12/155+~20/55)
计算:1/55+2/55+3/55+.+54/55
1/55+2/55+3/55+.+10/155-11/155-12/155-.-20/155=?
巧算:(10-7/55*1)+(9-7/55*2)+(8-7/55*3)+.+(1-7/55*10)
怎样简便计算 (10-7/55*1)+(9-7/55*2)+(8-7/55*3)+······+(1-7/55*10)
巧算:(10-7/55*1)+(9-7/55*2)+(8-7/55*3)……(1-7/55*10
55分之1+55分之2+55分之3+……+55分之9+55分之10-155分之11-155分之12-155分之13-……
1/55+2/55+3/55...+10/55-11/155-12/155-13/155-...-20/155