x+y+z=3(1) x+2y+3z=6(2) 2x+y+2z=5(3)解三元一次方程组
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x+y+z=3(1)x+2y+3z=6(2)2x+y+2z=5(3)解三元一次方程组x+y+z=3(1)x+2y+3z=6(2)2x+y+2z=5(3)解三元一次方程组x+y+z=3(1)x+2y+3
x+y+z=3(1) x+2y+3z=6(2) 2x+y+2z=5(3)解三元一次方程组
x+y+z=3(1) x+2y+3z=6(2) 2x+y+2z=5(3)
解三元一次方程组
x+y+z=3(1) x+2y+3z=6(2) 2x+y+2z=5(3)解三元一次方程组
x=3-y-z,从而3-y-z+2y+3z=3+y+2z=6 2x+y+2z=6-2y-2z+y+2z=6-y= 5 y=1; x=2-z
有3+y+2z=6得4+2z=6 z=1 从而x=1
即x=y=z=1
很简单啊。
第1个式子×2=2x+2y+2z.(4)
(4)-(3)=y=6-5=1
把y=1带入(1)=x+z=3-1=2 (5)
把y=1带入(2)=x+3z=6-2=4(6)
再用(6)-(5)=2z=2
z=1
最后把y=1,z=1带入(1)就可以求出x=1
所以x=1,y=1,z=1
解:(2)-(1)得 y+2z=3 (4)
把(4)代入(3)得 2x+3=5 x=1
把X=1代入(1)中得 y+z=2 (5)
(4)-(5)得 z=1
所以y=1
x+y+z=6 x+2y+3z=14 y+1=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)
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
(1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1.
若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值
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
x=2y-9z x+2y-3z=2 x-2y+6z=1
x+y-z=6 x-3y+2z=1 3x+y-z=4
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
x+y-z=6(1) x-3y+2z=1(2) 3x+2y-z=4(3) 求X Y Z 的值
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
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.