万能钥匙电脑版不能用:(x-y-z)(x+y+z)
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(x-y-z)(x+y+z)=x^2-y^2-z^2-2yz
(x-y-z)(x+y+z)
=[x-(y+z)][x+(y+z)]
=x^2-(y+z)^2
=x^2-y^2-z^2-2yz
(x-y-z)(x+y+z)
(x+y-z)(x-y+z)-(x-y-z)(x+y+z)
已知x,y,z为正实数,y*y=x*z,求证:x*x+y*y+z*z>(x-y+z)*(x-y+z)
正数x,y,z, xyz(x+y+z)=1,则(x+y)(x+z)最小值?
c语言#define M(x,y,z) x*y+z
X*X*X+Y*Y*Y=Z*Z*Z 有整数解没? X,Y,Z 不为0
因式分解(x+y+z)^3-(y+z-x)^3-(z+x-y)^3-(x+y-z)^3
已知数x、y、z满足x/y+z + y/z+x +z/x+y=1,求
求(X+2Y-Z)(X-2Y+Z)-(X+2Y+Z)
x-y+z=a,x+y-z=b,-x+y+z=c