1X1-2X2+3X3-4X4+5X5-6X6+.+2003X2003-2004X2004+2005X2005
x6+x5+x4+x3+x2+x+1=0,求x2003+x2004+x2005+x2006+x2007+X2008=?
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
初一数学在线解答1/1x2+1/2x3+.+1/2002x2003+1/2003x2004+1/2004x2005
解方程组X2+X3+X4=1 X1+X2+X3=5 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2
求编程高手.求x1+2*x2+3*x3+4*x4+5*x5+9*x6的最小值
方程组x1+x2+x3+x4+……+x2004+x2005=2005 x1+x2=x2+x3=x3+x4=……=x200
求齐次线性方程组x1+2x2+x3+x4+x5=1 2x1+4x2+3x3+x4+x5=2 -x1-2x2+x3+3x4
1x2/1+2x3/1+3x4/1+4x5/1+5x6/1+6x7/1
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7
(2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==?
1x2分之2005十2x3分之2005十3X4分之2005十4X5分之2005十…十2004X2005分之2005=()
已知数据X1,X2,X3,X4,X5的平均数是X拔,则一组新数据X1+1,X2+2,X3+3,X4+4,X5+5的平均数