3y+5z=50 3x-2z=-8 5x+2y=20

已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 x/2=y/3=z/5 x+3y-z/x-3y+z (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2 {x+y+z=1 x-2y+3z=5 2x-3y-3z=-8 x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=? x+y+z=-1 4x-2y+3z=5 y-z=8-2x {x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2 已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z= 已知:x+y+z=0,5x-3y-z=0,求:5x-y+z/2x+8y+7z 的值 三元一次方程组2x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=262x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=26 x+2y+3z=23 y-z=5 x+2z=10 解三元一次方程组1、x+y-z=4 2x-y+z=5 x-3y+z=-2 2、y+2z=-2 3x+y-4z=1 2x-y+2z=8 3、x-2y+z=-1 x+y+z=2x+2y+3z=-1 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z x/(y+z)=1/8,z/(x+y)=1/5解得x/z=2/3 x:y=3:2 y:z=2:5 x+2y-z=8