3x+y=6 x+2y-z=5 5x-3y+2z=4
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3x+y=6 x+2y-z=5 5x-3y+2z=4
3x+y=6 x+2y-z=5 5x-3y+2z=4
3x+y=6 x+2y-z=5 5x-3y+2z=4
3x+y=6 .(1)
x+2y-z=5 .(2)
5x-3y+2z=4 .(3)
解:(2)×2得
2X+4y-2Z=10.(4)
(3)+(4)得
7X+y=14.(5)
(5)-(1)得
4X=8
X=2
把X=2代入(1)得
3×2+y=6
y=0
把X=2,y=0代入(2)得
2+2×0-Z=5
Z=-3
∴原方程组的解为
X=2
y=0
z=-3
y=6-3x
x+2(6-3x)-z=5 得到 z=7-5x
把两个都代入最后一个 x=2 y=0 z=-3
x/2=y/3=z/5 x+3y-z/x-3y+z
若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+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)}=?
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
解方程组x+y+z=6 x+2y-3z=4 2x-y+z=5
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
x+y+z=1 4x+5y-z=6 x+2y-z=3
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31
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
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