(-3x^3y/9z^2)^2
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(-3x^3y/9z^2)^2
(-3x^3y/9z^2)^2
(-3x^3y/9z^2)^2
=(-x³y/3z²)²
=x的6次方y²/(9z的4次方)
(-3x^3y/9z^2)^2=x^6y²/9z^4
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
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
2(x+y)(x+y-z)+3(y-z)(x+y-z)
x+y=5 2x+3y-z=9 x-y+z=4
(x-3y+2z)(x+3y-2z)
(x-2y+3z)(x+2y-3z)
(2y-x-3z)(-x-2y-3z)
三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6
解方程 x+y+z=0 4x+2y+z=3 9x-3y+z=28解方程x+y+z=04x+2y+z=39x-3y+z=28
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
化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z}
2x+y-z=2 x-y+2z=2 3x+2y+4z=9
2x+y-z=2 x-y+2z=2 3x+2y+4z=9
3x+2y+z=9,x+y+2z=0,2x+3y-z=11
x=2y-9z x+2y-3z=2 x-2y+6z=1