已知x+y+z=5,且x^2+y^2+z^2=3,求xy+yz+xz的值
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已知x.y.z满足x-2y+z=0且7x+4y-5z=0,求x:y:z的值
已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=?
已知整数x、y、z,满足x≤y<z,且|x+y|+|y+z|+|z+x|=4,|x-y|+|y-z|+|z-x|=2,求x^2+y^2+z^2的值.
已知整数x,y,z满足x≤y<z,且|x+y|+|y+z|+|z+x|=4 |x-y|+|y-z|+|z-x|=2 那么x²+y²+z²的值
已知x,y,z满足方程组x-2y+z=0 7x+4y-5z=0,且z不等于0,2x²-3y²+z²/y²-2z²的值为?
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值.
已知x:y:z=2:3:4且x+z-y=36求x+y+z的值
已知x:y:z=2:3:4,且x+z-y=36.求x+y+z的值
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已知:x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值.
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
thank you已知x+3y+5z=0,2x+3y+z=0 且x、y、z.都不是0,则(2y-z)(2y+z)除以z的平方等多少?
已知4x-3y-6z=0,x+2y-7z=0,且x,y,z≠0,求2x+3y+6z/x+5y+5z的值.
已知x,y,z均不为0,且满足方程组{x+y-z=0,①2x-y-5z=0.②试求(2x+y+3z)/(3x-y-z)值.
已知x,y,z均不为0,且满足方程组x+y-z=0,2x-y-5z=0试求2x+y+3z/3x-y-z
已知x+y/2=y+z/3=z+x/4,且x+2y+z=12,求x-2y+z的值
已知x,y,z都是正数,且xyz=1,求证:x^2/(y+z)+y^2/(x+z)+z^2/(x+y)≥3/2