$\sqrt{x-2}+\sqrt{x^{2}-5}>3,x\in R$
cái đầu trừ 1 cái sau trừ 2 –  ๖ۣۜJinღ๖ۣۜKaido 12-02-16 10:53 AM
trường ơi lm hộ tớ đi –  Đức Anh 12-02-16 10:52 AM
Chuyển 3 sang nhân liên hợp –  nguyenquangtruonghktcute 12-02-16 08:58 AM
bạn chuyển vế :
$\sqrt{x-2}-1$+$\sqrt{x^2-5}-2$ >0  Đk : /x/ >= $\sqrt{5}$
Nhân liên hợp:
$\frac{x-2-1}{\sqrt{x-2}+1}+\frac{x^2-5-4}{\sqrt{x^2-5}+2}$>0
$\Leftrightarrow $ $\frac{x-3}{M1}+\frac{x^2-9}{M2}$ >0
$\Leftrightarrow $ (x-3).f(x) >0
Mà f(x) >0 do đkxđ suy ra x>3
hong có chi! Thanks –  Confusion 13-02-16 10:42 PM
cảm ơn bn nhìu –  Đức Anh 13-02-16 07:58 PM
liên hợp được (x-3).f(x) rồi c/m f(x) luôn dg ( dựa vào đkxđ đó ! )
okey no problem !!! –  Confusion 13-02-16 05:16 PM
lm ra cho rõ hộ mk nhé –  Đức Anh 13-02-16 04:47 PM
bạn lm đc chưa ??? Sr max –  Confusion 13-02-16 04:40 PM
mị trả lời hay nhỉnhư thế này thì khỏi cần nhé –  Đức Anh 13-02-16 04:38 PM

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