Mạnh hơn bất đẳng thức:
$$\left ( \,x^{\,2}\,+\, y^{\,2}\,+ \,z^{\,2}\, \right )^{\,2}\,- \,3\left ( \,x^{\,3}\,y\,+ \,y^{\,3}\,z\,+ \,z^{\,3}\,x \,\right )$$
$$\frac{\,4}{\,3}\,\left (\, x\,+\, y\,+\, z \,\right )\,\left ( \,x^{\,3}\,y\,+\, y^{\,3}\,z\,+\, z^{\,3}\,x \,\right )\,-\, x\,\left ( \,y^{\,2}\,+\, xz\,\right )^{\,2}\,-\, y\,\left ( \,z^{\,2}\,+\,xy \,\right )^{\,2}\,-\, z\left (\, x^{\,2}\,+\, yz \,\right )^{\,2}$$
Bài viết đã được chỉnh sửa nội dung bởi DOTOANNANG: 06-04-2018 - 20:14