Cho $a^2+b^2+c^2=1$. Tìm $GTNN$ $\sum \left | 6a^3+bc \right |$
Cho $a^2+b^2+c^2=1$. Tìm $GTNN$ $\sum \left | 6a^3+bc \right |$
It is the quality of one's convictions that determines success, not the number of followers
0 thành viên, 0 khách, 0 thành viên ẩn danh