-x+2y+3z=12 2x-2y+5z=13 3x+2y+z=10解三元一次方程过程也写下来急!
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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
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1
X=3z X+y+z=12 X+2y-2z=10
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
x/2+y+2z=12 x-y/3+z=5 x+y-z/2=3
三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31
x+2y-z=-5 x+y+2z=-1 3x+4y-2z=-12x+2y-z=3 2x+y+3z=0 4x+z=-4
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
3x-y+z=4,2z+3y-z=12,x+y+z=6的解
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
x+2y+3z=23 y-z=5 x+2z=10
x+2y=3x+2z=4y+z 求x:y:z