1x3+2x4+3x5+…9x11
1x2+2x3+3x4+4x5+……+10x11
2x2/1x3+4x4/3x5+6x6/5x7+8x8/7x9+10x10/9x11+12x12/11x13 仔细看看
2/1x3+2/3X5+2/5x7=2/7x9+2/9x11
解方程组X2+X3+X4=1 X1+X2+X3=5 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2
1/1x3+1/3x5+1/5x7+1/7x9+1/9x11=?
求齐次线性方程组x1+2x2+x3+x4+x5=1 2x1+4x2+3x3+x4+x5=2 -x1-2x2+x3+3x4
X1+X2+X3+X4+X5+X6+X7=2010,X1+X2=X3,X2+X3=X4,X3+X4=X5,X4+X5=X
已知1-1/3=2/1x3,计算1/1x3+1/3x5+1/5x7+1/7x9+1/9x11=
1x2/1+2x3/1+3x4/1+4x5/1+…+39x40/1
1/1x2+1/2x3+1/3x4+1/4x5.1/9x10简算
因式分解:X15+X14+X13+X12+X11+X10+X9+X8+X7+X6+X5+X4+X3+X2+X+1
简单线代题///X1+X2+X3+X4+X5=13X1+2X2+X3+X4+3X5=0 X2+2X3+2X4+6X5=3