1/1*2+1/2*3+1/3*4+.+1/98*99+1/99*100
=1-1/2+1/2-1/3+1/3-1/4+...+1/98-1/99+1/99-1/100
=1-1/100
=99/100
1/1*2+1/2*3+1/3*4+1/4*5.1/99*100=
1个回答
相关问题
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1/(1*2)+1/(2*3)+1*(3*4)+1/（4*5）……1/（98*99）+1/（99+100)=?
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(2√5+1)(1∕√2+√3+1/√3+√4+1/√4+√5+﹍+1/√99+√100)
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1/1*2+1/2*3+1/3*4+1/4*5+------+1/99*100
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1+1/2+1/3+2/3+1/4+2/4+3/4+...+1/100+2/100+...+99/100.
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1、1/(1*2*3）+1/(2*3*4)+1/(3*4*5)…………+1/(99*100*101)
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1/2*3+1/3*4+1/4*5+1/5*6+...+1/99*100
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1/1,1/2,2/2,1/3,2/3,3/3,1/4,2/4,3/4,4/4……1/100,2/100……99/100
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1/1,1/2,2/2,1/3,2/3,3/3,1/4,2/4,3/4,4/4……1/100,2/100……99/100
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1×2+23+3*4+4*5+5*6+…+99*100=1^2+1+2^2+2+3^2+3.+99^2+99=(1^2+