2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100
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2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x1002/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x1002/1x2+2/2x3+
2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100
2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100
2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100
2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100
=2×(1-1/2+1/2-1/3+……+1/99-1/100)
=2×(1-1/100)
=2×99/100
=99/50
2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100
=2(1/1x2+1/2x3+1/3x4+1/4x5+...+1/98x99+1/99x100)
=2*(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+............+1/98-1/99+1/99-1/100)
=2*(1-1/100)
=2*99/100
=99/50
因式分解x4+x3+2x2-x+3
因式分解:x4+x3+2x2 +x+1
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
解方程组X1-2x2+3x3-x4=1,3x1-x2+5x3-3x4=2,2x1+x2+2x3-2x4=3
写出方程组2*x1+x2-x3+x4=1,x1+2*x2+x3-x4=2,x1+x2+2*x3+x4=3的通解?
求非齐次线方程组的通解 :2x1+x2-x3+x4=1 x1+2x2+x3-x4=2 x1+x2+2x3+x4=3
具体写出方程组:2x1+x2-x3+x4=1;x1+2x2+x3-x4=2;x1+x2+2x3+x4=3的通解
x1+5x2-x3-x4=-1x1-2x2+x3+3x4=33x1+8x2-x3+x4=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
用初等行变换来解下列线性方程组(1)2x1-x2+3x3=3 3x1+x2-5x3=0 4x1-x2+x3=3 x1+3x2-13x3=-6(2) x1-2x2+x3+x4=1 x1-2x2+x3-x4=-1 x1-2x2+x3-5x4=5(3) x1-x2+x3-x4=1 x1-x2-x3+x4=0 x1-x2-2x3+2x4=-1/2
非齐次线性方程组求解.x1+x2+2x3+3x4=1 2x1+3x2+5x3+2x4=-3 3x1-x2-x3-2x4=-4 3x1+5x2+2x3-2x4=-10
讨论2X1+X2-X3+X4=1 3X1-2X2+2X3-3X4=2 5X1+X2-X3+2X4=-1 2X1-X2+X3-3X4=4的解的情况
{2X1 -X2 -X3 +X4 = 2{X1 +X2 -2X3 +X4 = 2{4X1 -6X2 +2X3 -2X4 = 4{X1 +4X2 -3X3 +2X4 = 1
1X2+2X3+3X4+.NX(N+1)
1X2+2X3+3X4+.NX(N+1)规律
1x2+2x3+3x4+.+2011x2012
1x2+2x3+3x4+4x5+.+15x16
1x2+2x3+3x4+.+100x101=