1/1*2+1/2*3+1/3*4+.1/1999*2000
1个回答
1/1*2+1/2*3+1/3*4+.1/1999*2000
=1-1/2+1/2-1/3+1/3-1/4+.+1/1999-1/2000
=1-1/2000
=1999/2000
相关问题
1/1*2+1/2*3+1/3*4+.+1/1998*1999+1/1999*2000
1/1*2+1/2*3+1/3*4……1/1999*2000
2000/2001-1999/2000+1998/1999-1997/1998+…+2/3-1/2〇1/2-1/3+1/
(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=
(1-1/2)+(1/2-1/3)+(1/3-1/4).+(1/1999-1/2000)
3/(1!+2!+3!)+4/(2!+3!+4!)+...+2000/(1998!+1999!+2000!)
怎么计算,(1-1/2)+(1/2-1/3)+(1/3-1/4)+.(1/1999-1/2000)
(-2000 5/6)+(-1999 2/3)-(-4000 3-4)-(1 1/2)
计算:(-1)+(+2)+(-3)+(+4)+···+(-1999)+(+2000)=
求证1-1/2+1/3-1/4.+1/1999-1/2000=1/1001+1/1002+.+1/2000