2002-1999+1996-1993+1990-1987.+16-13+10-7+4
2002-1999+1996-1993+1990-1987.+16-13+10-7+4
2002-1999+1996-1993+1990-1987+⋯+16-13+10-7+4
1,3,5,7,...1991,1993,1995,1997,1999和1,4,7,10,...1990,1993,19
在以下两个数串中:1,3,5,7…,1991,1993,1995,1997,1999和1,4,7,10,…,1990,1
在以下两个数串中:1,3,5,7…,1991,1993,1995,1997,1999和1,4,7,10,…,1990,1
有以下两个数串:1,3,5,7,…,1991,1993,1995,1997,1999和1,4,7,10,…,1990,1
数学问题1989+1991+1993+1995+1997+1999+2001/1990+1992+1994+1996+1
2001-2000-1999+1998+1997-1996+1995-1994-1993+1992+1991-1990+
1999+1998+1997-1996-1995-1994+1993+1992+1991-1990-1989-1988.
1999+1998+1997+1996-1995-1994-1993-1992+1991+1990+1989+1988-
计算:1999+1998+1997-1996-1995-1994+1993+1992+1991-1990-1989-19
1+2+3+4-5-6-7-8+...-1989-1990-1991-1992+1993+1994+1995+1996=