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Nội dung: <blockquote data-quote="son98" data-source="post: 143902" data-attributes="member: 300660">câu 1 cho <img src="https://codecogs.izyba.com/png.latex?x+y+z+t=8" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> và <img src="https://codecogs.izyba.com/png.latex?xy+yz+zt=18" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />  tìm Max, Min của <img src="https://codecogs.izyba.com/png.latex?t" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 2 cho <img src="https://codecogs.izyba.com/png.latex?x,y>0" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> thỏa mãn <img src="https://codecogs.izyba.com/png.latex?\sqrt{xy}(x-y)=xy" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> tìm MAx, Min của <img src="https://codecogs.izyba.com/png.latex?(x+y)" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 3 Giải hệ <img src="https://codecogs.izyba.com/png.latex?x^{3}-3x^{2}-9x+22=y^{3}+3y^{2}-9y+22" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />              và <img src="https://codecogs.izyba.com/png.latex?x^{2}+y^{2}-x+y=4" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 4 giải hệ  <img src="https://codecogs.izyba.com/png.latex?x^{2}+y^{2}+2y=4" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />                và  <img src="https://codecogs.izyba.com/png.latex?2x+y+xy=4" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 5 giải hệ <img src="https://codecogs.izyba.com/png.latex?xy(x+y)=2" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />               và <img src="https://codecogs.izyba.com/png.latex?9xy(3x-y) +6=26x^{3}-2y^{3}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 6 tìm Max <img src="https://codecogs.izyba.com/png.latex?3\sqrt{2x-1}+x\sqrt{5-4x^{2}}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 7 giải <img src="https://codecogs.izyba.com/png.latex?\frac{1}{(x-1)^{2}}+\sqrt{3x+1}=\frac{1}{x^{2}}+\sqrt{x+2}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 8 (QUAN TRỌNG NÈ ) <img src="https://codecogs.izyba.com/png.latex?0\leq a,b\leq 1" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> chứng minh<img src="https://codecogs.izyba.com/png.latex?\frac{1}{\sqrt{1+a^{2}}}+\frac{1}{\sqrt{1+b^{2}}}\leq \frac{2}{\sqrt{1+ab}}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 9 (QUAN TRỌNG NÈ ) <img src="https://codecogs.izyba.com/png.latex?a,b>0" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> chứng minh<img src="https://codecogs.izyba.com/png.latex?\frac{1}{1+2a}+\frac{1}{1+2b}\geq \frac{2}{ab+2}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 10 (QUAN TRỌNG NÈ ) <img src="https://codecogs.izyba.com/png.latex?a,b>0" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> chứng minh<img src="https://codecogs.izyba.com/png.latex?\frac{1}{(1+a)^{2}}+\frac{1}{(1+b)^{2}}\geq \frac{1}{ab+1}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 11 giải <img src="https://codecogs.izyba.com/png.latex?(\sqrt{4+x}-2)(\sqrt{4-x}+2)=2x" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 12 cho <img src="https://codecogs.izyba.com/png.latex?a^{2}+b^{2}+c^{2}=3" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />. Tim Min <img src="https://codecogs.izyba.com/png.latex?a^{2012}+b^{2012}+c^{2012}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 13 giải hệ <img src="https://codecogs.izyba.com/png.latex?x^{2}-2xy+x-2y+3=0" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />                 va <img src="https://codecogs.izyba.com/png.latex?y^{2}-x^{2}+2xy+2x-2=0" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 14 chứng minh <img src="https://codecogs.izyba.com/png.latex?\sqrt{a+2b+3c}+\sqrt{b+2c+3a}+\sqrt{c+2a+3b}\geq \sqrt{6}(\sqrt{a}+\sqrt{b}+\sqrt{c})" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Em xin cảm ơn tất cả những ai đã giải bài cho em, em sẽ thank tất cả các lời giải</blockquote>

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