已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
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已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
x+y-7z=0①x-2y+5z=0②
①-②得:3y-12z=0,即y=4z,2①+②得:3x-9z=0,即x=3z
所以x+2y-z/y-2x+12z=11/10,再来题难点的.
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