Cho \(\Delta ABC\). Xét biểu thức \(S=\frac{1}{p-a}+\frac{1}{p-b}+\frac{1}{p-c}\). Khẳng định nào sau đây đúng?
A.\(S\ge \frac{1}{4}.\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \right)\)
B. \(S\ge 4\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \right)\)
C. \(S\ge \frac{1}{2}.\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \right)\)
D.\(S\ge 2\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \right)\)
A.\(S\ge \frac{1}{4}.\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \right)\)
B. \(S\ge 4\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \right)\)
C. \(S\ge \frac{1}{2}.\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \right)\)
D.\(S\ge 2\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \right)\)
Loga
Hóa Học lớp 12
