1/2,1/6,1/12,1/20,1/30……100个数相加是多少
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1/2,1/6,1/12,1/20,1/30……100个数相加是多少
1/2,1/6,1/12,1/20,1/30……100个数相加是多少
1/2,1/6,1/12,1/20,1/30……100个数相加是多少
1/2+1/6+1/12+.+1/(100×101)
=1/2+1/2-1/3+1/3-1/4+...+1/100-1/101
=1-1/101
=100/101
1/2+1/6+...+1/100*101
=1/1/2+1/2-1/3+..+1/100-1/101
=1-1/101
=100/101
1/2+1/6+1/12+1/20+1/30+...=1/(1×2)+1/(2×3)+1/(3×4)+。。。+1/(100×101)
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+。。。+(1/99-1/100)+(1/100-1/101)
=1-1/101
=100/101