3y+2y+4z=4,x-y+z=2,那么y的最大值是多少?已知m是有理数,|m-2|+|m-4|+|m-6|+|m-8|的最小值是什么?

x+2y=3x+2z=4y+z 求x:y:z x+y/2=z+x/3=y+z/4 x+y+z=27 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 3x-y+z=4,2z+3y-z=12,x+y+z=6的解 2x+z=10 x+y-z=4 3x-y-z=0 (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z x/2=y/3=z/4,则x+2y-z/z=? x+y=5 2x+3y-z=9 x-y+z=4 {2x+y=10 {x-y+z=4 {3x-y-z=0 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 如果x:y=3:2,y:Z=4：2,那么x：y：Z= 如果x:y=2:3,y:z=4:3,则x:y:z=