x+2y-3z=10 3x+2y=10 6y+2z=-1解三元一次
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x+2y-3z=103x+2y=106y+2z=-1解三元一次x+2y-3z=103x+2y=106y+2z=-1解三元一次x+2y-3z=103x+2y=106y+2z=-1解三元一次1式乘以3得:
x+2y-3z=10 3x+2y=10 6y+2z=-1解三元一次
x+2y-3z=10 3x+2y=10 6y+2z=-1
解三元一次
x+2y-3z=10 3x+2y=10 6y+2z=-1解三元一次
1式乘以3得:3x+6y-9z=30
然后减去2式得4y-9z=20(4)
把3式转化为:y=-(1+2z)/6代入4式
得-2/3(1+2z)-9z=20 解得z= - 2
将z=-2代入3式得y=1/2
将y=1/2代入2式得x=3
把x,z用y表示,由1式可得y=0.5,带入2,3式,得x=3,z=-2
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
(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
3X+2y+z=20 x+y+z=10 Y=3X
{2x+y=10 {x-y+z=4 {3x-y-z=0
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
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
x+2y+3z=23 y-z=5 x+2z=10
x+y/2=2y-z/3=2 x-3y+z=10
x+2y+3z=10,x-y+4z=10,x+3y+2z=2
x+2y+3z=10,x-y+4z=10,x+3y+2z=2
解方程:{3x-y-z=2,{3y-x-z=-10,{3z-x-y=10
{x+2y+3z=11,x-y+7z=10,x+3y+2z=2
x-y+4z=10,x+3y+2z=2,x+2y+3z=11.