数学题X+Y+Z=111 Y/X=3/2 Y/2=5/6

x/2=y/3=z/5 x+3y-z/x-3y+z 问道数学题：已知x/4=y/5=z/6,求代数式2x+3y+4z/5x-3y-4z的值. 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 三元一次方程组数学题x+2y+2z=33x+y-2z=72x+3y-2z=10x-y=2z-x=3y+z=-1x-y-z (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 一道垃圾数学题已知4x=3y+5z, 2x+y=z 问X·X:Y·Y:Z·Z=多少 ,也就是X的平方比 Y的平方比Z的平 200分求数学题,急x+y-z=-14x-3y+2z=162x-2y-3z=5求z等于多少 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 2x+5y+4z=6,3x+y-7z=-4,x+y-z=?