作业帮(2x+y-z+3)(2x-y+z+3)写完整过程
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/18 12:24:27
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(2x+y-z+3)(2x-y+z+3)写完整过程
(2x+y-z+3)(2x-y+z+3)写完整过程
(2x+y-z+3)(2x-y+z+3)写完整过程
利用平方差公式：
(2x+y-z+3)(2x-y+z+3)
=[(2x+3)+(y-z)][(2x+3)-(y-z)]
=(2x+3)^2-(y-z)^2
=4x^2+12x+9-y^2+2yz-z^2
(2x+y-z+3)(2x-y+z+3)=[(2x+3)+(y-z)][(2x+3)-(y-z)]=(2x+3)²-(y-z)²=4x²+12x+9-y²-z²+2yz=4x²-y²-z²+2yz+12x+9
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-3y+2z)(x+3y-2z)
（x-2y+3z)(x+2y-3z)
(2y-x-3z)(-x-2y-3z)
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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}
(x+3y-2z)(x-3y-2z)-(x+3y-2z)^2
x/2=y/3=z/5 x+3y-z/x-3y+z
x+2y=3x+2z=4y+z 求x:y: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)
若x+y+z=3y=2z,则x/x+y+z=?
1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2)
求化简(x+3y+2z)(x-3y+6z)(x+3y+4z-2z)(x-3y+4z+2z)
(y+z-2x)^2+(z+x-2y)^2+(x+y-2z)^2-3(y-z)^2-3(z-x)^2-3(x-y)^2