第一题 x-3y+2z=0 ,3x-3y-4z=0 ,求 x:y:z= 第二题 2x+3y-4z=0 ,3x+4y+5z=0,求 x+y+z/x-y+z = 第三题 x+y=3a ,y+z=5a ,z+x=4a ,x-2y+3z=-10 ,求 a=
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![第一题 x-3y+2z=0 ,3x-3y-4z=0 ,求 x:y:z= 第二题 2x+3y-4z=0 ,3x+4y+5z=0,求 x+y+z/x-y+z = 第三题 x+y=3a ,y+z=5a ,z+x=4a ,x-2y+3z=-10 ,求 a=](/uploads/image/z/8674378-34-8.jpg?t=%E7%AC%AC%E4%B8%80%E9%A2%98+x-3y%2B2z%3D0+%2C3x-3y-4z%3D0+%2C%E6%B1%82+x%3Ay%3Az%3D+%E7%AC%AC%E4%BA%8C%E9%A2%98+2x%2B3y-4z%3D0+%2C3x%2B4y%2B5z%3D0%2C%E6%B1%82+x%2By%2Bz%2Fx-y%2Bz+%3D+%E7%AC%AC%E4%B8%89%E9%A2%98+x%2By%3D3a+%2Cy%2Bz%3D5a+%2Cz%2Bx%3D4a+%2Cx-2y%2B3z%3D-10+%2C%E6%B1%82+a%3D)
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