① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=39
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=39
3x+2y+z=39①2x+3y+z=34②x+2y+3z=26③要过程
x/2=y/3=z/5 x+3y-z/x-3y+z
① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=29 过程!
① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=29
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
已知x/2=y/4=z/7,求①x:y:z.②若2x+y+3z=58,分别求x,y,z的值.③求x+y/x+z的值.
①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
x+y+z=2 ① 2x+3y+z=38 ① x+y=3 3x-y-4z=5 ② 3x+4y+2z+56 ② y+z=5