2x+y-z=10 ,x+3y+2x=14 ,3x-y-2z=7
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2x+y-z=10 ,x+3y+2x=14 ,3x-y-2z=7
2x+y-z=10 ,x+3y+2x=14 ,3x-y-2z=7
2x+y-z=10 ,x+3y+2x=14 ,3x-y-2z=7
设2x+y-z=10为(1) ,x+3y+2z=14 为(2),3x-y-2z=7为(3)
(2)+(3)得
4x+2y=21,设这个式子为(4)
(1)*2-(3)得
x+3y=13,设这个式子为(5)
(5)×4-(4)得
10y=31
得y=3.1
将y代入(5)得
x=3.7
将x=3.7,y=3.1代入(1)
得z=0.5
题目抄错了吧第2个方程`
(1)2x+y-z=10
(2) x+3y+2z=14
(3) 3x-y-2z=7
(1)+(3)得5x-3z=17
(2)+(3)x3得10x-4z=35
就这样解,解出来代回去
10X+Y+1/3Z=10Y+X 10X+Y+2/3Z=100X+Y
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
分式加减的几道题目求速度1 .(x+y)²/(x-z)(y-z) - (y+z)²/(x-z)(y-z) = 2.2x+3y/x-y+2y/y-x-3y/x-y=
{3x-2y+z=-1 2x+y-3z=10 x-y-2z=1
[3x+2y+z=14,x+y+z=10,2x+3y-z=1]
3x+2y+z=4 x+y+z=10 2x+3y-z=1
3x+2y+z=14 { x+y+z=10 2x+3y-z=1
4x+y+z=-3 2x+3y-4z=-10 x+2y-z=-1
3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5
2x+3y+z=8 4x-y-z=10 x+2y-z=1
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
X=3z X+y+z=12 X+2y-2z=10
2x+z=10 x+y-z=4 3x-y-z=0
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z