解方程3x+2y=1 (1)2x-2y+2z=-5 (2)x+2y-z=3 (3)x y z 的值
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
已知X:Y=1:3,Y:Z=5:4 (1)求X:Y:Z (2)如果X+Y+Z=96,求X,Y,Z的值 3元1次方程
已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x:y:z的值
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y
1.解下列方程(1)(x+y=-2(x+z=13(y+z=1(2)(x-y-z=-1(3x+5y+7z=11(4x-y+
x/2=y/3=z/5 x+3y-z/x-3y+z
已知x/2=y/3=z/4,求下列各式 (1)(x+y+z)/x (2)(x-y+2x/(x-y-2z)
(1)已知3x=2y=z,求2x+y-z分之x-y+2z的值.(2)若(x+y):(3x-2y)=5:2,则x:y=?
已知{x:y:z=1:2:3,x+y+z=12,求x、y、z的值