1,TÌm $Min Q=\frac{2ab+a+b+c+c(ab-1)}{(a+1)(b+1)(c+1)}$ biết $a\leq b\leq 3\leq c, c\geq b+1, a+b\geq c$
2, Cho $abc+ bcd +cda + dab = 1$, tìm Min: $P=4(a^{3}+b^{3}+c^{3})+9d^{3}$
3, $ab+bc+ca=1$ CMR:$2abc(a+b+c)\leq$ $\frac{5}{9}+a^{4}b^{2}+b^{4}c^{2}+c^{4}a^{2}$
4, $0< a,b,c \leq 1$ CMR: $\frac{a(b+c)}{bc(1+a)}+\frac{a(c+a)}{bc(1+b)}+\frac{c(a+b)}{ab(1+c)}\geq \frac{6}{1+\sqrt[3]{abc}}$
5, $a,b,c>0$ CMR: $\sqrt{1+a^{2}}+\sqrt{1+b^{2}}+\sqrt{1+c^{2}}\geq \sqrt{a+b}+\sqrt{b+c}+\sqrt{c+a}$
Bài viết đã được chỉnh sửa nội dung bởi slenderman123: 08-07-2017 - 15:58