1/(2x2-1)+1/(4x4-1)+1/(6x6-1)+-----+1/(100x100-1)=
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1/(2x2-1)+1/(4x4-1)+1/(6x6-1)+-----+1/(100x100-1)=1/(2x2-1)+1/(4x4-1)+1/(6x6-1)+-----+1/(100x100-1)=
1/(2x2-1)+1/(4x4-1)+1/(6x6-1)+-----+1/(100x100-1)=
1/(2x2-1)+1/(4x4-1)+1/(6x6-1)+-----+1/(100x100-1)=
1/(2x2-1)+1/(4x4-1)+1/(6x6-1)+-----+1/(100x100-1)=
1/(n^2-1)=1/2[1/(n-1)-1/(n+1)]
原式=1/2[1-1/3+1/3-1/5+.+1/99-1/101]
=1/2(1-1/101)
=50/101
x+1/x=2 求x2+1/x2 x4+1/x4 的值x2+1/x2 x4+1/x4 2和4是平方。
因式分解x4+x2+1,
x2+x4+1 因式分解
用克拉默法则解下列方程组 x1-2x2+3x3-4x4=4 x2-x3+x4=-3 x1+3x2+2x4=1 -7x2+3x3+x4=3x1-2x2+3x3-4x4=4x2-x3+x4=-3 x1+3x2+2x4=1 -7x2+3x3+x4=3
分解因式(x4+x2-1)2+(x4+x2-1)-2,请用y代替x4+x2-1
因式分解:x4+x3+2x2 +x+1
确定a的值,使线性方程组{X1+X2+X3+X4=1,3X1+2X2+X5+X4=0,X2+2X3+2X4=a,5X1+4X2+3X2+3X4=2 并求通解
求解线性方程组 2X1+X2-X3+X4=1 4X1+2X2-2X3+2X4=2 2X1+X2-X3-X4=1 的通解
求非齐次线性方程组的通解:2x1+x2-x3-x4=1;2x1+x2+x3-x4=1;4x1+2x2+x3-2x4=2
求下列线性方程组的通解:2x1+x2-x3+x4=1,4x1+2x2-2x3+x4=2,2x1+x2-x3-x4=1
X1-X2+X3-X4=1X1-X2-X3+X4=02X1-2X2-4X3+4X4=-1麻烦高人用高斯消元法解下这个方程
x4+2x3+x2+1+2(x+x2)因式分解
4/5x4+2/5x2+1/5x16
1x2+2x3+3x4+4x5+.+15x16
1x1!+2x2!+3x3!+4x4!.nxn!
用列主元Gauss消元法解线性方程组{-x2-x3+x4=0,x1-x2+x3-3x4=1,2x1-2x2-4x3+6x4=-1,x1-2x2-4x3+x4=-1
求方程组X1-3X2-2X3-X4=1 3X1-8X2-4X3-X4=0 -2X1+X2-4X3+2X4=1 -X1-2X2-6X3+X4=2的解
求线性方程组{X1-3x2-2x3-X4=1;3X1-8X2-4X3-X4=0;-2X1+X2-4X3+2X4=1;-X1-2X2-6X3+X4=2的一般解.