解方程组1.用行列式解下列方程组：（1）.x1+2x2+3x3+

1.用行列式解下列方程组： （1）.x1+2x2+3x3+x4=0 (2).3x1+2x2+x3=5 x1+x2+2x3+3x4=0 2x1+3x2+x3=1 x1+5x2+x3+2x4=0 2x1+x2+3x3=11 x1+5x2+5x3+2x4=0 (3)2x1+x2+x3-2x4+2x5=1 5x1+2x2-x3-x4-x5=0 4x1-x2-3x3-2x4=0 2x1+x2+6x3-x4=0 6x1-4x2-3x4=0 2.2x1-3x2+4x3-3x4=0 3x1-x2+11x3-13x4=0 4x1+5x2-7x3-2x4=0 13x1-25x2+x3+11x4=0 验算方程组有解x1=x2=x3=x4=1,并由此求其系数行列式的值解方程组1.用行列式解下列方程组：（1）.x1+2x2+3x3+x4=0(2).3x1+2x2+x3=5x1+x2+2x3+3x4=02x1+3x2+x3=1x?