√x+3(2+√2x−1)⩾6

BPT <=>√x+3+√(x+3)(2x−1)≥6<=>√(x+3)(2x−1)≥6−√x+3<=>2x2+5x−3≥x+3+6−12√x+3<=>2x2+4x−12≥−12√x+3<=>x2+2x−6≥−6√x+3

Đến đây bình phương 2 vế là ra 
ak`, thiếu mất số 2 –  iamshant1207 21-11-13 09:29 PM
hình như bạn sai đề rồi kìa –  ♥♥♥ Panda Sơkiu Panda Mập ♥♥♥ 21-11-13 08:04 PM
xét ĐK nữa –  iamshant1207 21-11-13 01:54 PM

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