1/(1*2)+1/(2*3)+1/(3*4)+……+1/(19*20)=用简便算法写出过程快!谢谢
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1/(1*2)+1/(2*3)+1/(3*4)+……+1/(19*20)=用简便算法写出过程快!谢谢1/(1*2)+1/(2*3)+1/(3*4)+……+1/(19*20)=用简便算法写出过程快!谢谢
1/(1*2)+1/(2*3)+1/(3*4)+……+1/(19*20)=用简便算法写出过程快!谢谢
1/(1*2)+1/(2*3)+1/(3*4)+……+1/(19*20)=用简便算法写出过程
快!谢谢
1/(1*2)+1/(2*3)+1/(3*4)+……+1/(19*20)=用简便算法写出过程快!谢谢
1/1*2+1/2*3+1/3*4+1/4*5+1/5*6.1/19*20
=(1-1/2)+(1/2-1/3)+(1/3-1/4)…+(1/18-1/19)+(1/19-1/20)
=1-1/20
=19/20
原式=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...(1/19-1/20)
=1-1/20
=19/20
1/(1*2)+1/(2*3)+1/(3*4)+……+1/(19*20)
=1-1/2+1/2-1/3+1/3-1/4+...+1/19-1/20
=1-1/20
=19/20
=0.95
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