计算: (1)1+2-3-m+5+n-7-x+9+…+1990-1991-199
题型:填空题
问题:
计算:
(1)1+2-3-m+5+n-7-x+9+…+1990-1991-1992+1993+199m-1995-199n+1997+1997=______.
(2)3+n+9+12+15+…+1995+199x=______.
计算:
(1)1+2-3-m+5+n-7-x+9+…+1990-1991-1992+1993+199m-1995-199n+1997+1997=______.
(2)3+n+9+12+15+…+1995+199x=______.