作业帮5x-4y+2z=8 2x+7y-3z=19 3x+2y-z=18
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5x-4y+2z=8 2x+7y-3z=19 3x+2y-z=18
5x-4y+2z=8 2x+7y-3z=19 3x+2y-z=18
5x-4y+2z=8 2x+7y-3z=19 3x+2y-z=18
5x-4y+2z=8 1）
2x+7y-3z=19 2）
3x+2y-z=18 3）
将1）+3）×2得
5X-4Y+2Z+6X+4Y-2Z＝8+36
11X＝44
X＝4
将2）-3）×3得
2X+7Y-3Z-9X-6Y+3Z＝19-54
-7X+Y＝-35 4）
将X＝4代入4）中,得
-28+Y＝-35
Y＝-7
把X＝4,Y＝-7代入3）中,得
12-14-Z＝18
Z＝-20
解得：X＝4,Y＝-7,Z＝-20
(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