作业帮(x+y+2z)^2-(x-2y-3z)^2
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(x+y+2z)^2-(x-2y-3z)^2
(x+y+2z)^2-(x-2y-3z)^2
(x+y+2z)^2-(x-2y-3z)^2
(x+y+2z)^2-(x-2y-3z)^2
= (x+y+2z +x-2y-3z ) ( x+y+2z -x+2y +3z )
= (2x -y -z ) ( 3y + 5z )
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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)
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)
(x-3y+2z)(x+3y-2z)
（x-2y+3z)(x+2y-3z)
(2y-x-3z)(-x-2y-3z)
计算:x^2/(x-y)(x-z)+y^2/(y-x)(y-z)+z^2/(z-x)(z-y)
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}
化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(xy-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)速速回答
(x+3y-2z)(x-3y-2z)-(x+3y-2z)^2
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)