x-4y+z=-3 2x-y+z=18 x-y-z=12
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x-4y+z=-3 2x-y+z=18 x-y-z=12
x-4y+z=-3 2x-y+z=18 x-y-z=12
x-4y+z=-3 2x-y+z=18 x-y-z=12
x-4y+z=-3 (1)
2x-y+z=18 (2)
x-y-z=12 (3)
(2)-(1)得:
x+3y=21 (4)
(1)+(2)得:
2x-5y=9 (5)
(4)×2-(5)得:
11y=33
y=3
代入(4)得:
x=21-9=12
代入(1)得:
z=-3-12+12=-3
所以,方程组的解是:x=12;y=3;z=-3
x+y/2=z+x/3=y+z/4 x+y+z=27
x+2y=3x+2z=4y+z 求x:y:z
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
如果x/2=y/3=z/4,且x+y+z=18,那么x+y-z=?
x:y:z=3:4:7 2x-3y+z=18 求:3x-2y+z
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
x-4y+z=-3 2x-y+z=18 x-y-z=12
2x+z=10 x+y-z=4 3x-y-z=0
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1
X+2Y+3Z=18 X+4Y+3Z=24 Y=?
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
3x-y+z=4,2z+3y-z=12,x+y+z=6的解
4x-9z=17 3x+y+15z=18 x+2y+3z=24x-9z=17 3x+y+15z=18 x+2y+3z=2方程组
x/2=y/3=z/4,则x+2y-z/z=?
三元一次方程组 1.3x-y=5 x+2y+z=4 2x+3y-2z=-2 2.x-4y+z=3 2x+y-z=18 x-y-z=7
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、、、、、、、、、、