(7y-3z)-(8y-5z)
(7y-3z)-(8y-5z)
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
2x+3y-z=11 2x+y-5z=8 -2+7y+z=19
{7x+3y-5z=8 y:x:z=5:3:8
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-4
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
已知方程组3x+5y+3z=0,3x-5y-8z=0,并且z≠0,求x:z和y:z
三元一次方程组:1、3x+4z=7 2x+3y+z=9 5x-9y+7z=8 2、2x+4y=3z 3x-2y+5z 5
(1)3x+4z=7;2x+3y+z=9;5x-9y+7z=8 (2)3x+4y+z=14;x+5y+2z=17;2x+
已知5x=3y,4z=7y,求x:y:z
若x+3y+5z=10,5x+z+3y=8,x+y+z=?
解三元一次方程:x+y-z=0,2x+y+z=7,x-3y+z=8