x-2y=-9 y-z=3 2z+x=47x-2y=-9 y-z=3 2z+x=47三元一次方程
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x-2y=-9 y-z=3 2z+x=47
x-2y=-9
y-z=3
2z+x=47
三元一次方程
x-2y=-9 (1)
y-z=3 (2)
2z+x=47 (3)
由(2)得到y=z+3
代入(1)
x-2z-6=-9
x-2z=-3 (4)
(4)+(3)
2x=44
x=22
(3)-(4)
4z=50
z=25/2
y=z+3=31/2
相加2x-y+z=41
加方程2
2x=44
x=22
z=12.5
y=15.5
x=22
y=15.5
z=12.5
x-2y=-9 (1)
y-z=3 (2)
2z+x=47 (3)
由(2)得到y=z+3
代入(1)
x-2z-6=-9
x-2z=-3 (4)
(4)+(3)
2x=44
x=22
(3)-(4)
4z=50
z=25/2
y=z+3=31/2
9还是-9???
x=9+2y
z=y-3
所以..2(y-3)+9+2y=47
所以..4y+3=47
4y=44
y=11
x=31
z=8
1)x-2y=-9
2)y-z=3
3)2z+x=47
1)+2)*2 得到 4) x-2z=-3
3)-4) 得到 4z=50
z=12.5
带入2) y=15.5
带入3) x=22
所以 x=22 y=15.5 z=12.5
x-2y=-9 (1)
y-z=3 (2)
2z+x=47 (3)
(1)-(3)得-2Y-2Z=-9-47 2Y+2Z=56 (4)
(2)变形得Y=3+Z代入(4)得4Z=50 Z=25/2
则Y=31/2,X=22
x+y/2=z+x/3=y+z/4 x+y+z=27
x+2y=3x+2z=4y+z 求x:y:z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
x+y=5 2x+3y-z=9 x-y+z=4
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6
2x+z=10 x+y-z=4 3x-y-z=0
解方程 x+y+z=0 4x+2y+z=3 9x-3y+z=28解方程x+y+z=04x+2y+z=39x-3y+z=28
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
2x+y-z=2 x-y+2z=2 3x+2y+4z=9
2x+y-z=2 x-y+2z=2 3x+2y+4z=9
解方程组 x+y+z=5 2x-y-z=4 3x-2y-z=9
{x+y+z=0 {4x+2y+z=3 {9x+2y+z=6
{x+y+z=0 4x+2y+z=3 9x+3y+z=6
2x+3y-z=9,x+y+z=15,5x-4y-z=0
x+y+z+2,4x+2y+z+2,9x+3y+z=6解方程组