Cho a>=b;c>=d cm $\frac{ab+cd}{2}\geq \frac{(a+b)(c+d)}{4}$
can giai gap ts nhiu
Edited by trannguyen1998, 26-12-2013 - 10:24.
Cho a>=b;c>=d cm $\frac{ab+cd}{2}\geq \frac{(a+b)(c+d)}{4}$
can giai gap ts nhiu
Edited by trannguyen1998, 26-12-2013 - 10:24.
Cho a>=b;c>=d cm $\frac{ab+cd}{2}\geq \frac{(a+b)(c+d)}{4}$
can giai gap ts nhiu
Nếu $a,b,c,d$ không cùng dấu thì trái dấu chứ
Edited by khonggiadinh, 26-12-2013 - 20:30.
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