Giải bất phương trình: $$3^{x+1}+5^{x+2}\geq3^{x+2}+5^{x+1}$$
$3.3^x +25.5^x \ge 9.3^x + 5.5^x$

$\Leftrightarrow20.5^x \ge 6.3^x$

$\Leftrightarrow \bigg (\dfrac{5}{3} \bigg )^x \ge \dfrac{3}{10}$

$\Leftrightarrow x\ge \log_{\frac{5}{3}} \dfrac{3}{10}$
Mấy bài PT mũ ở trang 2 hay 3 ấy anh –  Xusint 25-10-13 09:55 PM
bài nào nhỉ –  Dép Lê Con Nhà Quê 25-10-13 09:46 PM
Anh xem giúp em mấy bài còn lại nhé –  Xusint 25-10-13 09:29 PM
... :D hjhe –  Dép Lê Con Nhà Quê 25-10-13 09:18 PM
À tới đó là xong rồi em nhầm à :D –  Xusint 25-10-13 09:11 PM
oh nó là thế mà chưa học thì bó tay ^^ –  Dép Lê Con Nhà Quê 25-10-13 09:05 PM
Anh ơi em mới học BPT mũ thôi ạ, em chưa học BPT Lôga ạ nên BPT cuối chưa biết giải ạ!!!! –  Xusint 25-10-13 08:06 PM

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