x-2y-3z=0 2x+y-2z=0 求X:Y:Z的值
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x-2y-3z=02x+y-2z=0求X:Y:Z的值x-2y-3z=02x+y-2z=0求X:Y:Z的值x-2y-3z=02x+y-2z=0求X:Y:Z的值x-2y-3z=0①2x+y-2z=0==>
x-2y-3z=0 2x+y-2z=0 求X:Y:Z的值
x-2y-3z=0 2x+y-2z=0 求X:Y:Z的值
x-2y-3z=0 2x+y-2z=0 求X:Y:Z的值
x-2y-3z=0 ①
2x+y-2z=0 ==> 4x+2y-4z=0 ②
①+2*②==>5x-7z=0 ==>x:z=7:5
x-2y-3z=0 ==> 2x-4y-6z=0 ③
2x+y-2z=0 ④
④-2*③==>5y+4z=0 ==>y:z=-4:5
x:z=7:5
y:z=-4:5
==>x:y:z=7:(-4):5
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方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1