x+2z=3,2x+y=4,2y+z=5用代入法
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 08:59:34
x+2z=3,2x+y=4,2y+z=5用代入法x+2z=3,2x+y=4,2y+z=5用代入法x+2z=3,2x+y=4,2y+z=5用代入法解x+2z=3①2x+y=4②2y+z=5③由①得:x=
x+2z=3,2x+y=4,2y+z=5用代入法
x+2z=3,2x+y=4,2y+z=5
用代入法
x+2z=3,2x+y=4,2y+z=5用代入法
解
x+2z=3 ①
2x+y=4 ②
2y+z=5 ③
由①得:x=3-2z ④
代入②得:2(3-2z)+y=4
即y-4z=-2 ⑤
③×4得:8y+4z=20 ⑥
⑤+⑥得:9y=18
∴y=2,z=1,x=1
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
x/2=y/3=z/5 x+3y-z/x-3y+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(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
x+y=5 2x+3y-z=9 x-y+z=4
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,
已知:4x-5y+2z=0 x+4y-3z=0则:(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.
x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=?
{ 5x-3y+z=25x+2y-4z=3-5x+y-z=2
3x-y+2z=-1 4x+y+z=5 x-2y-z=-2
x+y+z=4 2x-y+z=3 3x-2y-3z=-5
x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5