3(y-2)^2-(2y+z)(-z+2y)
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求Y(Z)=Z(Z+2)/(3Z-7)(Z+1)的z反变换
3(y-2)^2-(2y+z)(-z+2y)
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
因式分解3(y-z)的平方-(2y+z)(2y-z)因式分解3(y-z)^2-(2y+z)(-z+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-3y+2z)(x+3y-2z)
(x-2y+3z)(x+2y-3z)
(2y-x-3z)(-x-2y-3z)
化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(x-2z+y)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)
计算:(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)
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
计算:x^2/(x-y)(x-z)+y^2/(y-x)(y-z)+z^2/(z-x)(z-y)
(x+3y-2z)(x-3y-2z)-(x+3y-2z)^2
计算:3(y-z)^2-(2y+z)(-z+2y)
3(y-z)的2次方-(2y-z)(-z+2y)
计算3【y-z】的平方-【2y+z】【-z+2y】