X:Y=3:5,Y:Z=5:6 ,x+y+2z=40 这是三元一次方程组
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6x+5y+3z=100 x+y+z=30 求 x y
已知3X=4X,5Y=6Z求X+Y：Y+Z
x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z
x/2=y/3=z/5 x+3y-z/x-3y+z
若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)
X:Y=3:4,Y:Z=6:5=X:Y:Z=( ):( ):( )
已知x:y=3:6,y:z=8:5求x:y:z
已知x:y=3:5 y:z=6:1,求x:y:z( ):( ):( )
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
解方程组3x+y+z=6,x+3y+z=5,x+y+3z=9｛3x+y+z=6｛x+3y+z=5｛x+y+3z=9
x+y+z=4x-5y=y-x+6z,xyz不等0,x:y:z=?
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x/3=y/6=z/8 3x+5y-6z=-18 求x,y,z
x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5
y+z-3x=3z+x-3y=5x+y-3z=6
3x+y+z=6 x+3y+z=5 x+y+3z=9
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10