作业帮3x+2z-5y=4 5y-6x-9z=-12 x+y+z=53元一次方程组
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3x+2z-5y=4 5y-6x-9z=-12 x+y+z=53元一次方程组
3x+2z-5y=4 5y-6x-9z=-12 x+y+z=5
3元一次方程组
3x+2z-5y=4 5y-6x-9z=-12 x+y+z=53元一次方程组
3x+2z-5y=4 1)
5y-6x-9z=-12 2)
x+y+z=5 3)
1)+2),得
-3x-7z=-8
3x+7z=8 4）
3）×5-2）,得
11x+14z=37 5）
5）-4）×2,得
5x=21,x=21/5
代入4）,得z=-23/35
将x,z代入3）,得y=51/35
做了两遍都是这么多,你第一个方程确定是2z-5y么?
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
三元一次方程解 1.{x+y-z=5 {3x+2y+z=2 {2x-2y+z=-31.{x+y-z=5 2.{9x-5y+x=-6 3.{x-y=3 4.{x+y=3 5.{4x-2y+z=7{3x+2y+z=2 {9x+y-2z=3 {x+z=7 {y+z=4 {2x-y-3z=28{2x-2y+z=-3 {-9x+3y-5z=0 {y-z=6 {z+x=5 {x+y-2z=13
..1.x+y+z=26,2.4y+3z=7,y-z=1,3x+2z=17,x+2y-z=18 9x-7y=173.x-7y+3z=17 4.2x+4y+3z=95x-6y-z=24 3x-2y+5z=113x+7y-2z=1 5x-6y+7z=131.x+y+z=26,y-z=1x+2y-z=18 2.4y+3z=7,3x+2z=11,9x-7y=17 3.x-7y+3z=17 5x-6y-z=24 3x+7y-2z=14.2x+4y+3z=93x-2y+5z=11 5x-6y+7z=13
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-y+z=-1 5x+2y-z=6 4x-3y+2z=-5
解方程组 x+y+z=5 2x-y-z=4 3x-2y-z=9
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
2x+3y-z=9,x+y+z=15,5x-4y-z=0
{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
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
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.
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