3x+2y -x-3y 3x-4z=-9_____ = _____=4 y=12x-105 3 5x=3y=2z=17

x+y=5 2x+3y-z=9 x-y+z=4 x+2y=3x+2z=4y+z 求x:y:z x+y/2=z+x/3=y+z/4 x+y+z=27 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,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-2z-(x-2y)]-x-(3y-10z)}=? 三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6 解方程 x+y+z=0 4x+2y+z=3 9x-3y+z=28解方程x+y+z=04x+2y+z=39x-3y+z=28 化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z} 已知:2X-3y+2z=0,x+4Y-9/2z=0求:X:Z的值.X:y:Z的值.X+2y+X/X+y+Z的值. 已知:2X {x+y+z=0 4x+2y+z=3 9x+3y+z=6 2x+y-z=2 x-y+2z=2 3x+2y+4z=9 2x+y-z=2 x-y+2z=2 3x+2y+4z=9 解方程组 x+y+z=5 2x-y-z=4 3x-2y-z=9 {x+y+z=0 {4x+2y+z=3 {9x+2y+z=6 2x+3y-z=9,x+y+z=15,5x-4y-z=0 x+y+z+2,4x+2y+z+2,9x+3y+z=6解方程组