...x1+8x2+6x3-3x4=03x1+5x2+4x3-2x4=08x1+7x2+6x3-3?答:1 8 6 -3 0 -19 -14 7 0 -57 -42 21 r3-3r2,r2*(-1/19),r1-8r2 1 0 2/19 -1/19 0 1 14/19 -7/19 0 0 0 0 方程组的基础解系为 (2,14,-19,0)^T,(1,7,0,19)^T.,9,求齐次线性方程组的基础解系,x1+8x2+6x3-3x4=0 3x1+5x2+4x3-2x4=0 8x1+7x2+6x...