1/1*2+1/2*3+1/3*4+……1/99*100+1/100*101=?坐等,
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1/1*2+1/2*3+1/3*4+……1/99*100+1/100*101=?坐等,
1/1*2+1/2*3+1/3*4+……1/99*100+1/100*101=?坐等,
1/1*2+1/2*3+1/3*4+……1/99*100+1/100*101=?坐等,
1/1×2=1/2=1-1/2
1/2×3=1/6=1/2-1/3
1/3×4=1/12=1/3-1/4
.
1/100×101=1/10001=1/100-1/101
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+(-1/2+1/2)+(-1/3+1/3)-1/4+...++1/98+(-1/99+1/99)+(-1/100+1/100)-1/101
=1-1/101
=100/101
100/101
100/101
通过上述公式分解式子: 1/1-1/2+1/2-1/3+1/3-1/4+..............+1/99-1/100+1/100-1/101,除了第一项和最后项,其他每2项可以消去,最后化简为 1/1-1/101=1-1/101
1/1*2+1/2*3+1/3*4+……1/99*100+1/100*101
=1/1-1/2+1/2-1/3+...+1/99-1/100+1/100-1/101
=1-1/101
=100/101
原式=1-1/2+1/2-1/3+1/3-1/4+......+1/99-1/100+1/100-1/101=1-1/101=100/101
1+2+3+4+……+10000
1×2×3×4……×101
1+2+3+4……+101
1+2+3+4+5…………+100000000
(1/2+1/3+1/4+……+1/2013)(1+1/2+1/3+1/4+……+1/2012)-(1+1/2+1/3+……+1/2013)(1/2+……+1/2012)
(1/1+2)+(1/1+2+3)+(1/1+2+3+4)+………+(1/1+2+3+………+100)
1+2/2*1+2+3/2+3*1+2+3+4/2+3+4*……*1+2……+2001/2+3+……+2001=
1+2+3+4+5+6……………………+100000000=?
1/(1-1/2)/(1-1/3)/(1-1/4)/……/(1-1/2012)
2(3+1)(3^2+1)(3^4+1)……(3^32+1)+1
1+2+3+4……+100000好的加分…………急…………………………快……………………………………
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求证:1/2^3 +1/3^3 +1/4^3 +……+1/(n+1)^3
求证:1/2^3 +1/3^3 +1/4^3 +……+1/(n+1)^3
1+1×2+1×2×3+1×2×3×4……1×2×……×n=?
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200×(1-1/2)×(1-1/3)×(1-1/4)×……×(1-1/100)=?