z+y=3x,3x-9=y-1,5y-5=3x-7

已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. x+y=5 2x+3y-z=9 x-y+z=4 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 ..1.x+y+z=26,2.4y+3z=7,y-z=1,3x+2z=17,x+2y-z=18 9x-7y=173.x-7y+3z=17 4.2x+4y+3z=95x-6y-z=24 3x-2y+5z=113x+7y-2z=1 5x-6y+7z=131.x+y+z=26,y-z=1x+2y-z=18 2.4y+3z=7,3x+2z=11,9x-7y=17 3.x-7y+3z=17 5x-6y-z=24 3x+7y-2z=14.2x+4y+3z=93x-2y+5z=11 5x-6y+7z=13 已知x:y=3:5 y:z=6:1,求x:y:z( ):( ):( ) 解三元一次方程 {y=2x-1 {3x+y+5z=9 {x+2y=3z=6 {x+y+z=26 {x-y=1 {2x-y+z=18 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 3x+2y+z=9 x-3y-2z=1 -x+4y=5 {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 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 方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1 x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2 (x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 3x+y+z=6 x+3y+z=5 x+y+3z=9 {x+y+z=1 x-2y+3z=5 2x-3y-3z=-8