k,f为何值是方程组无解,解唯一,有无穷多解?在有解是,求出全部解 .k≠-2时,方程组有唯一解.当 k=-2时,r4+3r3 1 0 0 4 0 0
求线性方程组 x2-x3-x4=0 x1+x2-x3+3x4=1 x1-x2+x3+5x4=-1 x1+2x2-2x3+
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.解线性方程组｜X1+X2+X3+X4=5 ｜X1+2X2-X3+4X4=-2 ｜2X1-3X2-X3-5X4=-2 ｜