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vnmath98
#401303 MIN $\frac{4}{3+4x}+\frac{9}...
Posted by
on 02-03-2013 - 17:24
Cho x+y+z$\leq 12$ và a,b,c>0. Tìm MIN $\frac{4}{3+4x}+\frac{9}{2+9y}+\frac{16}{1+16z}$
#401300 $54x^{3}+1=y^{3}$
Posted by
on 02-03-2013 - 17:16
Giải phương trình: $54x^{3}+1=y^{3}$
- nguyen tien dung 98 likes this
#401297 $Max$$a^{2}+b^{2}+c^{2}$
Posted by
on 02-03-2013 - 17:14
Cho $a+b+c=1$ và $a,b,c\geq 0$. Tìm $Max$$a^{2}+b^{2}+c^{2}$
- nguyen tien dung 98 likes this
#399119 $Max$$\sum a^{2012}(2013-a^{2})$
Posted by
on 22-02-2013 - 18:02
Cho a,b,c dương. Tìm $Max$$\sum a^{2012}(2013-a^{2})$
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