如果Y=2X-1,Z=3Y,那么X+Y+Z等于( ).A; 9X-4 B; 9X-3 C; 9X-2 D; 9X-1
如果y=3x,z=2(y-1),那么x-y+z等于( )
(x-2y+z)/9=(2x+y+3z)/10=-(3x+2y-4z)/3=1 连等,求x,y,z,
(1)3x+4z=7;2x+3y+z=9;5x-9y+7z=8 (2)3x+4y+z=14;x+5y+2z=17;2x+
已知方程组{x+y+z=2,2x-y+z=-1,x+3y+4z=3的解是{x=2-a,y=-2b,z=2-3c,那么a,
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
(z-2x)的二次方+|y-2z|=0,则代数式2x+2y+z等于( ) A 5x B 9x c 12x d 16x
1.已知x+y=-1,y+z=5,z+x=4,则x+y+z=等于( )A 1 B 2 C 3 D 4
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
如果3y=x+2y,那么x *x+9*y*y+4*z*z-6xy-12yz+4xz的值是多少?
X+Y+Z=0 4X+2Y+1=-3Z X+4Y=9
(1)x:y:z=3:2:5,2x+3y+8=5 (2)5x-3y+z=5,4x+3y-2z=9x-5y-z=-17
解方程组1、4x+9y=12,3y-2z=1,2x+6z=32、3x-y+2z=3,2x+y-3z=11,x+y+z=1