3x+y-z=012x+4y-4z=0和x+2y-4z=0相减的11x+2y=011x+2y=0得x/y=-2/113x+y-z=06x+2y-2z=0和x+2y-4z=0相减的5x+2z=05x+2z=0得x/z=-2/5所以x:y:z=-2:11:5
若x+2y-4z=0 3x+y-z=0 则 x:y:z= ————
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