如果X:Y=5:4,X:Z=4:5,那么X:Y:Z=():():
已知4X=7Y+5Z,2X+Y=Z,那么X:Y:Z的值是?
已知3X=4X,5Y=6Z求X+Y:Y+Z
一道数奥题,(x+y-z)²+(y+z-4)=-|z+x-5|
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-
若2x+5y+4z=6,3x+y-7z=-4,那么x+y-z的值是多少?
x,y,z都是int型变量,且x=3,y=4,z=5,那么表达式x||++y&&!z||1的值是多少,怎么算
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
已知2x+5y+4z=6.3x+y-7z=-4 求 x+2y+z
已知x:y:z=3:4:5,3x+2y-4z=18.求:x+y+z.
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10