已知4x-3y-6z=0..2x+4y-14z=0 (x,y,z不为0) 则2x^2+3y^2+6z^2除以x^2+5y^2+7z^2的值为
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![已知4x-3y-6z=0..2x+4y-14z=0 (x,y,z不为0) 则2x^2+3y^2+6z^2除以x^2+5y^2+7z^2的值为](/uploads/image/z/1989087-15-7.jpg?t=%E5%B7%B2%E7%9F%A54x-3y-6z%3D0..2x%2B4y-14z%3D0+%EF%BC%88x%2Cy%2Cz%E4%B8%8D%E4%B8%BA0%EF%BC%89+%E5%88%992x%5E2%2B3y%5E2%2B6z%5E2%E9%99%A4%E4%BB%A5x%5E2%2B5y%5E2%2B7z%5E2%E7%9A%84%E5%80%BC%E4%B8%BA)
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已知4x-3y-6z=0..2x+4y-14z=0 (x,y,z不为0) 则2x^2+3y^2+6z^2除以x^2+5y^2+7z^2的值为
已知4x-3y-6z=0..2x+4y-14z=0 (x,y,z不为0) 则2x^2+3y^2+6z^2除以x^2+5y^2+7z^2的值为
已知4x-3y-6z=0..2x+4y-14z=0 (x,y,z不为0) 则2x^2+3y^2+6z^2除以x^2+5y^2+7z^2的值为
已知4x-3y-6z=0 即 4x-3y=6z
.2x+4y-14z=0 .2x+4y=14z
解得x=3z y=2z x^2=9z^2 y^2=4z^2
( 2x^2+3y^2+6z^2)/(x^2+5y^2+7z^2)=(18z^2+12z^2+6z^2)/(9z^2+20z^2+7z^2)
=(36z^2)/(36z^2)
=1