王者荣耀小乔高清图片:1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)……1/(19*20)=?
来源:百度文库 编辑:中科新闻网 时间:2024/04/28 10:02:16
请算出最后结果,并写出过程。
1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)……1/(19*20)=1-1/2+1/2-1/3.......+1/19-1/20=1-1/20=19/20
(1-1/2)*(1+1/2)*(1-1/3)*(1+1/3)*……*(1-1/99)*(1+1/99)。
(1/2)-[1/(x+1)]
(1/2+1/3+...+1/1999)*(1+2/1+...+1/1998)—(1+1/2+...+1/1999)*(1/2+1/3+....+1/1998)
1+1/1+2/=??
1/9,2/27,1/27,()
(2 3/1-3 2/1+1 45/4)/(-1 6/1)
1+1/(1+2)+1/(1+2+3)+...+1/(1+2+3+...+100)
1+1/1+2+1/1+2+3+......+1/1+2+3+......+10
(1-1/2^2)(1-1/3^2)....(1-1/10^2)
(1-1/2^2)(1-1/3^2)....(1-1/10^2)