3x+2y+4z=8 2x+5y+7z=19 4x+6y+z=17
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3x+2y+4z=82x+5y+7z=194x+6y+z=173x+2y+4z=82x+5y+7z=194x+6y+z=173x+2y+4z=82x+5y+7z=194x+6y+z=17(1)式*3-
3x+2y+4z=8 2x+5y+7z=19 4x+6y+z=17
3x+2y+4z=8 2x+5y+7z=19 4x+6y+z=17
3x+2y+4z=8 2x+5y+7z=19 4x+6y+z=17
(1)式*3-(3)式得
5x+11z=5 (4)式
(2)式*6-(3)式*5得
29z-8x=29 (5)式
(4)式*8+(5)式*5得
88z+145z=185
z=185/233
x=1-(19*11/233)=24/233
24*3/233+2y+4*185/233=8
y=526/233
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z=
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
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
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
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 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2
x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=?
{x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
x+y+z=-1 4x-2y+3z=5 y-z=8-2x
X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21
3x+7y+4z=35,x+5y+2z=40,x+y+z=( )
{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38