1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
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
1x2+2x3+3x4+4x5······100x101答案是几?
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)==?
计算1x2+2x3+3x4+4x5+...+99x100
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
有整数x1,x2,x3,x4,x5,x6,x7.x1
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