3x-2y=8 (1) 2x+3y+2z=9.5 (2) 2x-2y+z=6 (3)
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3x-2y=8 (1) 2x+3y+2z=9.5 (2) 2x-2y+z=6 (3)
3x-2y=8 (1) 2x+3y+2z=9.5 (2) 2x-2y+z=6 (3)
3x-2y=8 (1) 2x+3y+2z=9.5 (2) 2x-2y+z=6 (3)
3x-2y=8 (1)
2x+3y+2z=9.5 (2)
2x-2y+z=6 (3)
⑶×2-⑵得:2X-7Y=2.5……⑷
⑴×2-⑷×3得:Y=0.5,
把Y=0.5代入⑴得:X=3,
把X、Y代入⑶得:Z=1.
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
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{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
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=
x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
已知xyz≥0,x+y+z=1,化简x(2y-z)/(1+x+3y)+y(2z-x) /(1+y+3z) +z(2x-y)/(1+z+3x)
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
x+y+z=6 x+2y+3z=14 y+1=z
{x+2y+z=8{2x-y-z=-3{3x+y-2z=-1
{x+2y+z=8,2x-y-z=-3,3x+y-2z=-1
{x+y+z=1 x-2y+3z=5 2x-3y-3z=-8
x+y+z=-1 4x-2y+3z=5 y-z=8-2x
2x+3y+z=8 4x-y-z=10 x+2y-z=1
{x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2