1x2/1+2x3/1+3x4/1……+98x99/1+99x100/1=?简便计算。 随便采纳
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1x2/1+2x3/1+3x4/1……+98x99/1+99x100/1
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+......+(1/98-1/99)+(1/99-1/100)
=1-1/2+1/2-1/3+1/3-1/4+......+1/98-1/99+1/99-1/100
=1-1/100
=99/100
1x2/1+2x3/1+3x4/1……+98x99/1+99x100/1
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+......+(1/98-1/99)+(1/99-1/100)
=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)+(1/2-1/3)+(1/3-1/4)+......+(1/98-1/99)+(1/99-1/100)
=1-1/2+1/2-1/3+1/3-1/4+......+1/98-1/99+1/99-1/100
=1-1/100
=99/100
1x2/1+2x3/1+3x4/1……+98x99/1+99x100/1
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+......+(1/98-1/99)+(1/99-1/100)
=1-1/2+1/2-1/3+1/3-1/4+......+1/98-1/99+1/99-1/100
=1-1/100
=99/100
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