（5*4X3*3—5*3X3*2+5*2X3）除15我一晚没睡,大哥大姐赶紧帮帮我,就这一道题了,我要休息啊.

(5^4x3^3-5^3x3^2+5^2x3)÷15=? 解线性方程组 x1-x2-x3=2 x1+x2+4x3=0 3x1+5x3=3 max Z=2X1+4X2-5X3 X1+X2+X3=7 2X1-3X2+X3≥10 X1.X2.X3≥0 求极限(2x3-3x+4)/(8+5x2-3x3) (3X3+5X2+X)/(7X3+5X-4) x3+x+2 x3-4x2-4x-5 因式分解 求下面线性规划问题的对偶问题minZ- -x1+3x2-5x3-2x1+6x2-x3≥30X1+4x2-3x3≤20X1-x2+x3- -4X1≤0,x2≥0,x3 无约束 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 (-5)x3又3分之1+2x3又3分之1+(-6)x3又3分之1 求解线性方程组 X1+X2+X3=6 2X1+3X2+X3=11 X1-X2+2X3=5 线性方程组{2x1-x2-2x3=λx1{5x1-3x2-3x3=λx2{-x1+2x3=-λx3有非零解,则λ= ｛2X1-X2+3X3=33X1+X2-5X3=04X1-X2+X3=3X1+3X2-13X3=-6{X1-2X2+3X3-4X4=4X2-X3+X4=-3X1+3X2-3X4=1-7X2+3X3+X4=-3 解线性方程组x1+x2+x3+x4=2;2x1+3x2+4x3+3x4=5;x1+3x2+5x3+3x4=4 用消元法解线性方程X1+2X2+3X3=4 3X1+5X2+7X3=9 2X1+3X2+4X3=5 解线性方程组x1+x2+3x3+4x4=5 2x1+4x2+4x3+6x4=8 -x1-2x2-x3-2x4=-3 求解x1+x2-2x3=5 3x1-2x2+3x3=4 -x1+3x2+x3=4 解线性方程组 X1+2X2+3X3=4 3X1+5X2+7X3=9 5X1+8X2+11X3=14 解线性方程组 X1+2X2+3X3=4 3X1+5X2+7X3=9 5X1+8X2+11X3=14