4X+Y=14...1 5Y+2Z=60...2 7X-Z=2.3如何解
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4X+Y=14...1 5Y+2Z=60...2 7X-Z=2.3如何解
4X+Y=14...1 5Y+2Z=60...2 7X-Z=2.3如何解
4X+Y=14...1 5Y+2Z=60...2 7X-Z=2.3如何解
1式*5-2式
得:20X-2Z=10.4
3式*2-4式
得:6X=6
X=1
代入1式还有3式
Y=10.Z=5
5x+y+z=1 2x-y+2z=1 x+5y-z=4
x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5
3x-y+2z=-1 4x+y+z=5 x-2y-z=-2
x+y+z=-1 4x-2y+3z=5 y-z=8-2x
x+y+z=-5,3x+y+z=1,4x+3y+2z=-2快
x+y+z=1 4x+5y-z=6 x+2y-z=3
{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
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
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
三元一次方程 X-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 X=?Y=?Z=?
三元一次方程组{5x+y+z=1 2x-y+2z=1 x+5y-z=4 求X Y Z的值
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
{5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-1
解三元一次方程组1、x+y-z=4 2x-y+z=5 x-3y+z=-2 2、y+2z=-2 3x+y-4z=1 2x-y+2z=8 3、x-2y+z=-1 x+y+z=2x+2y+3z=-1
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x+2y-z=-5 x+y+2z=-1 3x+4y-2z=-12x+2y-z=3 2x+y+3z=0 4x+z=-4
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
三元一次方程组解法 4x+y-z=12 x+y+z=26 3x+2y+z=-5 x-y=1 x-y+5z=1 2x-y+z=18 急 急、、、、、、、、、、