x+y+z=60 x+2y+5z=200 x=y+4 解方程组x+y+z=60 x+2y+5z=200 x=y+4解方程组
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x+y+z=60 x+2y+5z=200 x=y+4 解方程组x+y+z=60 x+2y+5z=200 x=y+4解方程组
x+y+z=60 x+2y+5z=200 x=y+4 解方程组
x+y+z=60 x+2y+5z=200 x=y+4
解方程组
x+y+z=60 x+2y+5z=200 x=y+4 解方程组x+y+z=60 x+2y+5z=200 x=y+4解方程组
x+y+z=60
x+2y+5z=200
x=y+4代入2式和1式
3y+5z=196
2y+z=56两边乘5
10y+5z=280
做差得7y=84
y=12
x=16
z=32
x/2=y/3=z/5 x+3y-z/x-3y+z
(x+y-z)(x-y+z)=
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已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
(x-2y+z)(x+y-2z)分之(y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y) + (y+z-2z)(x-2y+z)分之(x-z)(y-z)=?第三部分那个是 (y+z-2x)(x-2y+z)分之(x-z)(y-z)
x+y+z=60 x+2y+5z=200 x=y+4 解方程组x+y+z=60 x+2y+5z=200 x=y+4解方程组
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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.
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
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
x+2y+3z=23 y-z=5 x+2z=10
(x+y-z)^2-(x-y+z)^2=?
(x-y-z)*( )=x^2-(y+z)^2 填空
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值