1/1x3+1/3x5 +1/(2n-1)(2n+2)=n/2n+1

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1/1x3+1/3x5 +1/(2n-1)(2n+2)=n/2n+1
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1/1x3+1/3x5 +1/(2n-1)(2n+2)=n/2n+1
1/1x3+1/3x5 +1/(2n-1)(2n+2)=n/2n+1

1/1x3+1/3x5 +1/(2n-1)(2n+2)=n/2n+1
1/1x3+1/3x5 +1/(2n-1)(2n+2)
=½[1-1/3+1/3-1/5+······+1/(2n-1)-1/(2n+1)]
=½(2n)/(2n+1)
=n/(2n+1)

因式分解：x5+x3+1 1x2+2x3+3x4+4x5+.+n(n+1)+n(n+2)=? 1x2+2x3+3x4+4x5.n(n+1)等于多少?急救! 1/1x3+1/3x5 +1/(2n-1)(2n+2)=n/2n+1 解一道方程组x1+x2+x3=5,x2+x3+x4=1,x3+x4+x5=-5,x4+x5+x1=-3,x5+x1+x2=2 1/1x3+1/2x4+1/3x5+ 1x2+2x3+3x4+4x5+.+15x16 x1-x2+x3=1 x2-x3+x4=2 x3-x4+x5=3 x4-x5+x1=4 x5-x1+x2=5 求x1,x2,x3,x4,x5 等比数列中,求和:(2-3X5^-1)+(4-3X5^-2)+.(2n-3X5^-n) (2-3X5^-1)+(4-3X5^-2)+.(2n-3X5^-n)求和 求解线性方程组 x1-2x2+3x3-x4-x5=2 x1+x2-x3+x4-2x5=1 2x1-求解线性方程组x1-2x2+3x3-x4-x5=2x1+x2-x3+x4-2x5=12x1-x2+x3-2x5=22x1+2x2-5x3+2x4-x5=5 sn=1/1x3+4/3x5+9/5x7+```````+n2/(2n-1)x(2n+1) 1x2+2x3+3x4+4x5+.+n(n+1)等于多少?急救!请写下过程,谢谢 一道简便计算数学题1X2+2X3+3X4+4X5...+n(n+1)一1X2+2X3+3X4+4X5...+2013X2014二写出规律三当n=4026为多少 x5-x4+x3-x2+x-1因式分解 X5-X4+X3+X2+X+1因式分解 求非齐次线性方程组的通解x1+3x2+5x3-4x4=1x1+3x2+2x3-2x4+x5=-1x1-2x2+x3-x4-x5=3x1+2x2+x3-x4-x5=3 1x5+2x5+3x5+4x5+5x5… 麻烦给我一个公式.