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x+4y-3z=0(1) 4x-5y+2z=0(2) (1)×5+(2)×4得 21x-7z=0 ∴z=3x 把z=3x代入(1)得 x+4y-9x=0 ∴y=2x 把y=2x,z=3x代入 3y-5z分之2x-y+3z,得: 原式=(6x-15x)/(2x-2x+9x) =-9x/9x =-1
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