(1+9/55)+(1+9/55×2)+(1+9/55×3)+……+(1+9/55×10)
(10-3/55×1)+(9-3/55×2)+(8-3/55×3)+……+(2-3/55×9)+(1-3/55×10)=
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-……
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)
巧算:(10-7/55*1)+(9-7/55*2)+(8-7/55*3)……(1-7/55*10
(1) 1/55+2/55+……+9/55+10/55-11/155-12/155-……-19/155-20/155
简便计算,(10-7/55*1)+(9-7/55*2)+(8-7/55*3)+...+(1-7/55*10)
简算(10-55分之4×1)+(9-55分之4×2)+(8-55分之4×3)+……+(2-55分之4×1)+(1-55分
简算10-55分之4×1)+(9-55分之4×2)+(8-55分之4×3)+……+(2-55分之4×1)+(1-55分之
3/1×5+3/5×9+3/9×13+……+3/55×59
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)