2x+4y+3z=6 1 3x-2y+5z=11 2 5x-6y+8z=13 3
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2x+4y+3z=613x-2y+5z=1125x-6y+8z=1332x+4y+3z=613x-2y+5z=1125x-6y+8z=1332x+4y+3z=613x-2y+5z=1125x-6y+8
2x+4y+3z=6 1 3x-2y+5z=11 2 5x-6y+8z=13 3
2x+4y+3z=6 1 3x-2y+5z=11 2 5x-6y+8z=13 3
2x+4y+3z=6 1 3x-2y+5z=11 2 5x-6y+8z=13 3
用加减消元法.
把2式两边同时乘以2,得:
6x-4y+10z=22 4
1式+2式 得:
8x+13z=28 5
把2式两边同时乘以3,得:
9x-6y+15z=33 6
6式-3式 得:
4x+7z=20 7
把7式两边同时乘以2得:
8x+14z=40 8
8式-5式,得:
z=12 代入7式
4x+84=20
x=-16
把x=-16,z=12代入1式
-32+4y+36=6
y=1/2
则x=-16,y=1/2,z=12是方程组的解.
x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5
x+y+z=1 4x+5y-z=6 x+2y-z=3
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
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.
..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
解三元一次方程组:(1)x+2y+3z=11x-y+4z=10x+3y+2z=2(2)x:y=3:5y:z=5:6x+y+2z=40(3)x+y-z=2y+z-x=4z+x-y=6谢谢!
(1)2X+4Y+3Z=93X-2Y+5Z=115X-6Y+7Z=13(2)X:Y=3:2Y:Z=5:4X+Y+Z=66(3)3X-Y+Z=32X+Y-3Z=11X+Y+Z=13以上3个题目为三元一次方程~
已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z.请说明道理,
已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
4X+3Y-2Z=-7,5X-6Y+Z=1,2X+Z=-2
4X+3Y-2Z=-7,5X-6Y+Z=1,2X+Z=-2
方程组3x+y-4z=1 2x-y-2z=6 5x+3y-3z= --1/2{负二分之一} x=?y=?z=?3x+2y+z=13 x+y+2z=7 2x+3y-z=12 x=?y=?z=?
x+y+z=6 x+2y+3z=14 y+1=z
x+y-z=6 x-3y+2z=1 3x+2y-z=4 阿
x+y-z=6,x-3y+2z=1,3x+2y-z=4
x+y-z=6 x-3y+2z=1 3x+2y-z=4
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10