1-2+3-4+5....-1992+1993
来源:百度知道 编辑:UC知道 时间:2024/06/05 01:42:41
如题:
1-2+3-4+5-6+……+1991-1992+1993
=(1-2)+(3-4)+(5-6)+……+(1991-1992)+1993
=-1*1992/2+1993
=-996+1993
=997
1-2+3-4+5-6....-1992+1993
=1+(3-2)+(5-4)+(7-6)+(9-8)+…+(1993-1992)
=1+1+1+1+1+…+1(总共有1992/2+1=997个1)
=997
最后答案为997。
回答的好的话望采纳。
1+1993+(-2-1992)=0
类推,都抵消了,最后剩下最中间的数
等于(1+1993)/2=997
1-2+3-4+5-6+……+1991-1992+1993
=1+(3-2)+(5-4)+.....+(1993-1992)
=1+[(1993-1)/2]*1`
=1+996
=997
正确答案是:997
1-2+3-4+5....-1992+1993
=(1-2)+(3-4)+(5-6)+...+(1991-1992)+1993
=-996+1993
=997
1-2+3-4+5....-1992+1993
1+2+3+4+5...........+9999=?
1/1*3+1/2*4+1/3*5......+1/48*50
1/2*3+1/3*4+1*4*5.....1/99*100
1*3+2*4+3*5......19*21=?
1*3+2*4+3*5.........+48*50
1/1*2+1/2*3+1/3*4+1/4*5...+1/99*100
求1-1/2+1/3-1/4+1/5.......极限
谁会求和 1+1/2+1/3+1/4+1/5...........
1/1*2*3+1/2*3*4+1/3*4*5......+1/18*19*20