5x+y-2z 4 x+2y-3z 2x-3y+5z三元一次方程组
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5x+y-2z 4 x+2y-3z 2x-3y+5z三元一次方程组
5x+y-2z 4 x+2y-3z 2x-3y+5z三元一次方程组
5x+y-2z 4 x+2y-3z 2x-3y+5z三元一次方程组
等号都没
没等号的能叫方程么
化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z}
(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
x+2y=3x+2z=4y+z 求x:y:z
x/2=y/3=z/5 x+3y-z/x-3y+z
x+y/2=z+x/3=y+z/4 x+y+z=27
数学--整式运算4(x-y+z)-2(x+y-z)-3(-x-y-z)
1.(x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2)
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
x+y=5 2x+3y-z=9 x-y+z=4
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
因式分解:25x y^2 z^2 (x+y-z)-30xyz(z-x-y)^2+5x y z^3 (z-x-y)
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
求化简(x+3y+2z)(x-3y+6z)(x+3y+4z-2z)(x-3y+4z+2z)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
已知:4x-5y+2z=0 x+4y-3z=0则:(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.