(1994+1992+1990...4+2)-(1+3+5+...+1993)
1994-1993+1992+1991-1990.+5-4+3+2-1=
1994-1993+1992+1991-1990+1989+1988-1987+.+5-4+3+2-1=
1+2+3+4-5-6-7-8+9+10.-1992+1993+1994+1995+1996
(2+4+6+…+1992+1994)—(1+3+5+…+1991+1993)=?
1+2-3+4-5+6-7+8-9+10-11+.+1992-1993+1994等于多少
(1992/1993+1993/1994+1/2)*(1992/1993+1993/1994+1994/1995)-(1
(1996+1994+1992+……+6+4+2)-(1+3+5+……+1991+1993+1995)等于多少?
1+2+3+4-5-6+7+8-9-10+11+12-13-14+15+...+1992-1993-1994+1995等
1+2+3+4-5-6-7-8+...-1989-1990-1991-1992+1993+1994+1995+1996=
【题目】计算 1998+1997-1996-1995+1994+1993- 1992-1991+…+6+5-4-3+2+
计算:1996+1995-1994-1993+1992+1991-1990-1989+…+4+3-2-1,结果是____
1994 1/1992×1992/1993