解方程x1×2+x2×3+x3×4+…+x2009×2010=2009
解方程x1×2+x2×3+x3×4+…+x2009×2010=2009
已知|x1-1|+|x2-2|+|x3-3|+...+|x2009-2009|+|x2010-2010|=0,求代数式x
写出方程x1+x2+x3+…x2009+x2010=x1*x2*x3*…*x2009*x2010的一组正整数根
解方程组x1+x2=x2+x3=x3+x4=……=x2007+x2008=x2008+x2009=1,x1+x2+x3+
方程x1×2+x2×3+x3×4+…+x2010×2011=2010
1/1x2+1/2x3+1/3x4+1/4x5+```````+1/2008x2009=?
.解线性方程组|X1+X2+X3+X4=5 |X1+2X2-X3+4X4=-2 |2X1-3X2-X3-5X4=-2 |
解线性方程组 求齐次线性方程组X1+X2+X3+X4=0,2X1+3X2+4X3+5X4=0,4X1+5X2+6X3+7
X1-X2+X4=2X1-2X2+X3+4X4=32X1-3X2+X3+5X4=X+2在有解的情况下求方程当λ为几何时,
写出下面线性规划的对偶规划min Z=3X1+2X2+X3; X1+X2+X3≤6;X1-X3≥4;X2-X3≥3;X1
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+......1/2008x2009
解方程组x1+x2=4,x2+x3=-6,x3+x1=2