(1/2+1/3+1/4+…+2002)*(1+1/2+1/3+1/4+…1/2001)-(1+1/2+1/3+…1/2002)*(1/2+1/3+…+1/2001)用未知数求解.1/2+1/6+1/12+…1/n*(n+1)n=?求n如有好的加分sorry,我打错了,正确的第二题如下:1/2+1/6+1/12+…1/n*(n
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![(1/2+1/3+1/4+…+2002)*(1+1/2+1/3+1/4+…1/2001)-(1+1/2+1/3+…1/2002)*(1/2+1/3+…+1/2001)用未知数求解.1/2+1/6+1/12+…1/n*(n+1)n=?求n如有好的加分sorry,我打错了,正确的第二题如下:1/2+1/6+1/12+…1/n*(n](/uploads/image/z/6119183-47-3.jpg?t=%EF%BC%881%2F2%2B1%2F3%2B1%2F4%2B%E2%80%A6%2B2002%EF%BC%89%2A%EF%BC%881%2B1%2F2%2B1%2F3%2B1%2F4%2B%E2%80%A61%2F2001%EF%BC%89-%EF%BC%881%2B1%2F2%2B1%2F3%2B%E2%80%A61%2F2002%EF%BC%89%2A%EF%BC%881%2F2%2B1%2F3%2B%E2%80%A6%2B1%2F2001%EF%BC%89%E7%94%A8%E6%9C%AA%E7%9F%A5%E6%95%B0%E6%B1%82%E8%A7%A3.1%2F2%2B1%2F6%2B1%2F12%2B%E2%80%A61%2Fn%2A%EF%BC%88n%2B1%EF%BC%89n%3D%3F%E6%B1%82n%E5%A6%82%E6%9C%89%E5%A5%BD%E7%9A%84%E5%8A%A0%E5%88%86sorry%2C%E6%88%91%E6%89%93%E9%94%99%E4%BA%86%2C%E6%AD%A3%E7%A1%AE%E7%9A%84%E7%AC%AC%E4%BA%8C%E9%A2%98%E5%A6%82%E4%B8%8B%EF%BC%9A1%2F2%2B1%2F6%2B1%2F12%2B%E2%80%A61%2Fn%2A%EF%BC%88n)
(1/2+1/3+1/4+…+2002)*(1+1/2+1/3+1/4+…1/2001)-(1+1/2+1/3+…1/2002)*(1/2+1/3+…+1/2001)用未知数求解.1/2+1/6+1/12+…1/n*(n+1)n=?求n如有好的加分sorry,我打错了,正确的第二题如下:1/2+1/6+1/12+…1/n*(n
(1/2+1/3+1/4+…+2002)*(1+1/2+1/3+1/4+…1/2001)-
(1+1/2+1/3+…1/2002)*(1/2+1/3+…+1/2001)
用未知数求解.
1/2+1/6+1/12+…1/n*(n+1)
n=?
求n
如有好的加分
sorry,我打错了,正确的第二题如下:
1/2+1/6+1/12+…1/n*(n+1)=2003/2004呢
n=?
求n
如有好的加分
(1/2+1/3+1/4+…+2002)*(1+1/2+1/3+1/4+…1/2001)-(1+1/2+1/3+…1/2002)*(1/2+1/3+…+1/2001)用未知数求解.1/2+1/6+1/12+…1/n*(n+1)n=?求n如有好的加分sorry,我打错了,正确的第二题如下:1/2+1/6+1/12+…1/n*(n
(1/2+1/3+1/4+…+2002)*(1+1/2+1/3+1/4+…1/2001)-
(1+1/2+1/3+…1/2002)*(1/2+1/3+…+1/2001)
设1/2+1/3+1/4+***+1/2001=X 1/2+1/3+1/4+**+1/2002=Y
则原式=Y*(X+1)-(Y+1)*X=XY+Y-XY-X=Y-X=1/2002
1/2+1/6+1/12+…1/n*(n+1)
=1/(1*2)+1/(2*3)+***+1/(N(N+1))
=1-1/2+1/2-1/3+***+1/N-1/(N+1)
=1-1/(N+1)
=N/(N+1)