若4x-3y-6z=0,x+2y-7z=0(xyz≠),求代数式5x²+2y²-z²/2x²-3y²-10z²的值.
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若4x-3y-6z=0,x+2y-7z=0(xyz≠),求代数式5x²+2y²-z²/2x²-3y²-10z²的值.
若4x-3y-6z=0,x+2y-7z=0(xyz≠),求代数式5x²+2y²-z²/2x²-3y²-10z²的值.
若4x-3y-6z=0,x+2y-7z=0(xyz≠),求代数式5x²+2y²-z²/2x²-3y²-10z²的值.
若4x-3y-6z=0,
x+2y-7z=0(xyz≠0),
8y+3y-28z+6z=0;
11y=22z;
y=2z;
x=3z;
代数式5x²+2y²-z²/2x²-3y²-10z²
=(5×9z²+2×4z²-z²)/(2×9z²-3×4z²-10z²)
=52/-4;
=-13;
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