X+Y=23 X=Y+Z Z=X-3 X=? Y=? Z=?
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(x+y-z)(x-y+z)=
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
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
z+=x>y?++x:
x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z
已知x+y+z=0求证x*x*x+y*y*y+z*z*z=3xyz
证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
x+y/2=z+x/3=y+z/4 x+y+z=27
若x+y+z=3y=2z,则x/x+y+z=?
x/2=y/3=z/5 x+3y-z/x-3y+z
x+2y=3x+2z=4y+z 求x:y:z
x+2y+3z=23 y-z=5 x+2z=10
X+Y=23 X=Y+Z Z=X-3 X=?Y=?Z=?
X+Y=23 X=Y+Z Z=X-3 X=? Y=? Z=?