x-2y+3z=4 2x+y+4z=9 3x-2y-z=-4 解方程组
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x-2y+3z=4 2x+y+4z=9 3x-2y-z=-4 解方程组
x-2y+3z=4 2x+y+4z=9 3x-2y-z=-4 解方程组
x-2y+3z=4 2x+y+4z=9 3x-2y-z=-4 解方程组
解方程组x-2y+3z=4 ①2x+y+4z=9 ②3x-2y-z=-4 ③
①+②×2得5x+11z=22④
①-③ 得﹣2x+4z=8 即﹣x+2z=4 ⑤
联立④⑤并解得x=0,z=2
把得x=0,z=2代入②得y+8=9
y=1
∴x=0,y=1,z=2
x-2y+3z=4(1)
2x+y+4z=9 (2)
3x-2y-z=-4 (3)
(1)乘2-(2)5y-2z=1
(1)乘3-(3)2y-5z=-8
解得y=1,z=2带入(1)得x=0
x=0,y=1,z=2.
x-2y+3z=4 2x+y+4z=9 3x-2y-z=-4 方程3-方程1,得:x-2z=-4,x=2z-4 将x=2z-4 代入方程2和方程3中,得: 8z+y=17 5z-2y=8 解上述两个方程,可得 ...
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x-2y+3z=4 2x+y+4z=9 3x-2y-z=-4 方程3-方程1,得:x-2z=-4,x=2z-4 将x=2z-4 代入方程2和方程3中,得: 8z+y=17 5z-2y=8 解上述两个方程,可得 z=2, y=1 由此可得:x=2z-4=2*2-4=0 由此可解出: x=0;y=1;z=2 刚看错了个数,又重新算了下! 谢谢,忘能帮到你。忘采纳!
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x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
x+y=5 2x+3y-z=9 x-y+z=4
2x+z=10 x+y-z=4 3x-y-z=0
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
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
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
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
2x+3y+z=13 4x^2+9y^2+z^2-2x+15y+3z=82 求x,y,z
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