作业帮2x+3y-4z=-7 x-4y/3=2y+3z/2=2怎么解
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2x+3y-4z=-7 x-4y/3=2y+3z/2=2怎么解
2x+3y-4z=-7 x-4y/3=2y+3z/2=2怎么解
2x+3y-4z=-7 x-4y/3=2y+3z/2=2怎么解
x-4y/3=2y+3z/2=2
x=2+4y/3
z=(4-4y)/3
2x+3y-4z=-7
2*(2+4y/3)+3y-4(4-4y)/3=-7
y=5/11
x=86/33
z=8/11
2x+3y-4z=-7 (1)
x-4y/3=2y+3z/2=2
所以x-4y/3=2
2y+3z/2=2
所以
3x-4y=6 (2)
4y+3z=4 (3)
(1)×3-(2)×2
6x+9y-12z-6x+8y=-21-12
17y-12z=-33 (4)
(3)×4+(4)
16y+12z+17y-12...
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2x+3y-4z=-7 (1)
x-4y/3=2y+3z/2=2
所以x-4y/3=2
2y+3z/2=2
所以
3x-4y=6 (2)
4y+3z=4 (3)
(1)×3-(2)×2
6x+9y-12z-6x+8y=-21-12
17y-12z=-33 (4)
(3)×4+(4)
16y+12z+17y-12z=16-33
33y=-17
y=-17/33
代入(4)
z=(17y+33)/12=200/99
代入(2)
x=(6+4y)/3=130/99
所以x=130/99,y=-17/33,z=200/99
收起
x-4y/3=2y+3z/2=2
x=2+4y/3
z=(4-4y)/3
2x+3y-4z=-7
2*(2+4y/3)+3y-4(4-4y)/3=-7
y=5/11
x=86/33
z=8/11
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
解方程：{2x+3y+z=7,x+y+z=4,3x+y-z=-4{2x+3y+z=7,x+y+z=4,3x+y-z=-4要过程
x：y：z=3:4:7 2x-3y+z=18 求：3x-2y+z
x+2y+4z=17 2x+y+z=7 3x+y+2z=11
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
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
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z
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
{5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-1
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
2x+z=10 x+y-z=4 3x-y-z=0
解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1