2个回答
2013-07-09
展开全部
1/(1/10+1/11+1/12+1/13+1/14+1/15+1/16+1/17+1/18+1/19)>1/(1/10+1/10+1/10+1/10+1/10+1/10+1/10+1/10+1/10+1/10)=1/(10/10)=1
1/(1/10+1/11+1/12+1/13+1/14+1/15+1/16+1/17+1/18+1/19)<1/(1/19+1/19+1/19+1/19+1/19+1/19+1/19+1/19+1/19+1/19)=1/(10/19)=1.9
所以
1/(1/10+1/11+1/12+1/13+1/14+1/15+1/16+1/17+1/18+1/19)化简后整数部分是1
1/(1/10+1/11+1/12+1/13+1/14+1/15+1/16+1/17+1/18+1/19)<1/(1/19+1/19+1/19+1/19+1/19+1/19+1/19+1/19+1/19+1/19)=1/(10/19)=1.9
所以
1/(1/10+1/11+1/12+1/13+1/14+1/15+1/16+1/17+1/18+1/19)化简后整数部分是1
2013-07-09
展开全部
1/10*11+1/11*12+1/12*13+1/13*14+....+1/49*50
=1/10-1/11+1/11-1/12+1/12-/-1/13+1/13-1/14+....+1/49-1/50
=1/10-1/50
=4/50
=2/25
=1/10-1/11+1/11-1/12+1/12-/-1/13+1/13-1/14+....+1/49-1/50
=1/10-1/50
=4/50
=2/25
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