(9999+9997+.+9001)-(1+3+.+999)
(9999+9997+.+9001)-(1+3+.+999)
1.765×213÷27+765×327÷27 2.(9999+9997+…+9001)-(1+3+…+999) 3.1
(2010+2008+2006+.+2)-(1+3+5+.+2009)
(+1)+(-2)+(+3)+(-4)++(+99)+(-100)等于几?
计算:(+1)+(-3)+(+5)+(-7)+⋯+(+97)+(-99)
1.(2+4+6+.1984+1986+1988)-(1+3+5+.+1985+1987)=?
9+99+999+9999
简便计算 (1)9+98+996+9997 (2)1999+2998+396+497
1+(-2)+3+(-4)+…+2005+(-2006)+2007+(-2008)+2009
(1+3+5+7+……+99+101)-(2+4+6+8+……+98+100)怎么写
9999999999+999999999+99999999+99999+9999+999+99+9=?
111+222+333+444+555+666+777+888++++++++++++++++++++++999=?