作业帮3(y-2)^2-(2y+z)(-z+2y)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/14 14:49:04
3(y-2)^2-(2y+z)(-z+2y)
3(y-2)^2-(2y+z)(-z+2y)
3(y-2)^2-(2y+z)(-z+2y)
当-1≤x≤2,-1≤y≤2,-1≤z≤3时原方程成立,
∴当x=-1,y=-1,z=-1时,x+2y+3z值最小,x+2y+3z=-6
当x=2,y=2,z=3时,x+2y+3z值最大,x+2y+3z=15.
3(y-2)^2-(2y+z)(-z+2y)
=3(y-2)^2+(2y+z)(2y-z)
=3(y-z)^2+4y^2-z^2
=3y^2-6yz+3z^2+4y^2-z^2
=7y^2-6yz+2z^2
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】