1-2+3-4-6+.+2001-2002
问题描述:
1-2+3-4-6+.+2001-2002
答
1-2+3-4+5-6+.+2001-2002 =(1-2)+(3-4) +(5-6)+.+(2001-2002 ) =(-1 ) + ( - 1 ) + ( - 1) +.+( - 1) = - 1001
1-2+3-4-6+.+2001-2002
1-2+3-4+5-6+.+2001-2002 =(1-2)+(3-4) +(5-6)+.+(2001-2002 ) =(-1 ) + ( - 1 ) + ( - 1) +.+( - 1) = - 1001