x+y=-13 y+z=-15 z+x=-14求X Y Z的值
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(x+y-z)(x-y+z)=
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=?
(y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
X+Y-Z=15 X+5Y+10Z=70 求:X、Y、Z
fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14
z+=x>y?++x:
用行列式的性质证明:y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证?
x=y; y=z; z=x/y
X+Y+Z=15 X+5Y+10Z=70,Y.Z的值
(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=-13 y+z=-15 z+x=-14求X Y Z的值
z=x^(y/z) 偏导数
2x+3y+z=13 4x^2+9y^2+z^2-2x+15y+3z=82 求x,y,z
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z