\(\left\{{}\begin{matrix}\sqrt{x}+\sqrt{xy}+\sqrt{y}=11+12\sqrt{13}\\x+y=134\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}\left(\sqrt{x}+1\right)\left(\sqrt{y}+1\right)=12+12\sqrt{13}\\x+y=134\end{matrix}\right.\)

Đặt \(\left\{{}\begin{matrix}\sqrt{x}+1=a\\\sqrt{y}+1=b\end{matrix}\right.\) \(\left(a,b>0\right)\)

\(Hpt\Leftrightarrow\left\{{}\begin{matrix}ab=12+12\sqrt{13}\\a^2+b^2-2\left(a+b\right)+2=134\end{matrix}\right.\)

\(\Leftrightarrow a^2+b^2+2ab-2\left(a+b\right)+1=134+12+12\sqrt{13}-1\)

\(\Leftrightarrow\left(a+b\right)^2-2\left(a+b\right)+1=145+12\sqrt{13}\)

\(\Leftrightarrow\left(a+b-1\right)^2=145+12\sqrt{13}\)

\(\Leftrightarrow a+b=\sqrt{145+12\sqrt{13}}+1\)

\(Hpt\Leftrightarrow\left\{{}\begin{matrix}ab=12+12\sqrt{13}\\a+b=\sqrt{145+12\sqrt{13}}+1\end{matrix}\right.\)

Số xấu quá nên dừng tại đây :D

Đặt \(\left(x-1;y-2;z-3\right)=\left(a;b;c\right)=abc>0\)

Điều kiện bài toán trở thành :

\(a+1+b+2+c+3< 9\)

\(\sqrt{a+\sqrt{b}+\sqrt{c}}+\sqrt{c+5\left(a+1\right)+4\left(b+2\right)+3+\left(c+3\right)}\)

\(=\left(a+1\right)\left(b+2\right)=\left(b+2\right)\left(c+3\right)=\left(c+3\right)+\left(a+1\right)+11+a+b+c< 3\)

\(a+b+c< 3\)

\(=\sqrt{a+\sqrt{b}+\sqrt{c}+ab+bc+ca}\)

Mặt khác, do  không âm, ta luôn có:

\(\text{⇒2√a≥a(3−a)≥a(b+c)⇒2a≥a(3−a)≥a(b+c) (1)}\)

Hoàn toàn tương tự ta có:\(\text{ 2√b≥b(c+a)2b≥b(c+a) (2)}\)

\(\text{2√c≥c(a+b)2c≥c(a+b) (3)}\)

Cộng vế với vế (1);(2);(3):

Dấu "=" xảy ra khi và chỉ khi \(\text{a=b=c=0a=b=c=0 hoặc a=b=c=1a=b=c=1}\)

Nhường t nhé.Rảnh t làm

= \(\dfrac{\sqrt{xy}-1+\sqrt{yz}-3+\sqrt{zx}-5}{3+9+6}\) = \(\dfrac{11-\left(1+3+5\right)}{18}\)=\(\dfrac{1}{9}\)

Áp dụng tính chất của dãy tỉ số bằng nhau ta có:

\(\dfrac{\sqrt{xy}-1}{3}=\dfrac{\sqrt{yz}-3}{9}=\dfrac{\sqrt{zx}-5}{6}=\dfrac{\sqrt{xy}+\sqrt{yz}+\sqrt{zx}-1-3-5}{3+9+6}=\dfrac{11-9}{18}=\dfrac{1}{9}\)

\(\Rightarrow\left\{{}\begin{matrix}\sqrt{xy}-1=\dfrac{1}{9}.3=\dfrac{1}{3}\\\sqrt{yz}-3=\dfrac{1}{9}.9=1\\\sqrt{zx}-5=\dfrac{1}{9}.6=\dfrac{2}{3}\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}\sqrt{xy}=\dfrac{4}{3}\\\sqrt{yz}=4\\\sqrt{zx}=\dfrac{17}{3}\end{matrix}\right.\Rightarrow}\left\{{}\begin{matrix}xy=\dfrac{16}{9}\\yz=16\\zx=\dfrac{289}{9}\end{matrix}\right.\Rightarrow}\left[{}\begin{matrix}\left\{{}\begin{matrix}x=\dfrac{17}{9}\\y=\dfrac{16}{17}\\z=17\end{matrix}\right.\\\left\{{}\begin{matrix}x=-\dfrac{17}{9}\\y=-\dfrac{16}{17}\\z=-17\end{matrix}\right.\end{matrix}\right.\)

f)\(\frac{x\sqrt{y}+y\sqrt{x}}{\sqrt{xy}}:\frac{1}{\sqrt{x}-\sqrt{y}}\)

\(=\frac{\sqrt{xy}\left(\sqrt{x}+\sqrt{y}\right)}{\sqrt{xy}}.\left(\sqrt{x}-\sqrt{y}\right)\)

\(=x-y\)

b)\(\sqrt{11-4\sqrt{7}}-\sqrt{2}.\sqrt{8+3\sqrt{7}}\)

\(=\sqrt{7-4\sqrt{7}+4}-\sqrt{16+6\sqrt{7}}\)

\(=\sqrt{\left(\sqrt{7}-2\right)^2}-\sqrt{9+6\sqrt{7}+7}\)

\(=\sqrt{7}-2-\sqrt{\left(3+\sqrt{7}\right)^2}\)(vì \(\sqrt{7}>2\))

\(=\sqrt{7}-2-3-\sqrt{7}=-5\)

c)\(\frac{x+\sqrt{xy}}{y+\sqrt{xy}}=\frac{\sqrt{x}\left(\sqrt{x}+\sqrt{y}\right)}{\sqrt{y}\left(\sqrt{x}+\sqrt{y}\right)}=\frac{\sqrt{x}}{\sqrt{y}}=\frac{\sqrt{xy}}{y}\)

d)\(\frac{\sqrt{x}}{\sqrt{x}-1}-\frac{2\sqrt{x}-1}{x-\sqrt{x}}=\frac{x-2\sqrt{x}+1}{\sqrt{x}\left(\sqrt{x}-1\right)}=\frac{\left(\sqrt{x}-1\right)^2}{\sqrt{x}\left(\sqrt{x}-1\right)}=\frac{\sqrt{x}-1}{\sqrt{x}}=\frac{x-\sqrt{x}}{x}\)

ĐKXĐ : \(2\le x,y,z\le4\)

Từ hệ phương trình ta suy ra được

\(\Sigma x+\Sigma\sqrt{x-2}+\Sigma\sqrt{4-x}=\Sigma x^2-5\Sigma x+33\\ \Leftrightarrow\Sigma\left(x^2-6x+9\right)+6=\Sigma\left(\sqrt{x-2}+\sqrt{4-x}\right)\\ \Leftrightarrow\Sigma\left(x-3\right)^2+6=\Sigma\left(\sqrt{x-2}+\sqrt{4-x}\right)\left(1\right)\)

Áp dụng bất đẳng thức \(\sqrt{A}+\sqrt{B}\le\sqrt{2\left(A+B\right)}\)

\(\Sigma\left(\sqrt{x-2}+\sqrt{4-x}\right)\le\Sigma\sqrt{2\left(x-2+4-x\right)}=\Sigma2=6\)

\(\Rightarrow\Sigma\left(x-3\right)^2+6\le6\Rightarrow\Sigma\left(x-3\right)^2\le0\)

Mà \(\Sigma\left(x-3\right)^2\ge0\)

\(\Rightarrow\left(x-3\right)^2=\left(y-3\right)^2=\left(z-3\right)^2=0\\ \Leftrightarrow x=y=z=3\)

Thay vào ta thấy thỏa mãn -> x=y=z=3 là nghiệm hpt

trùi s ghim lên đay cx k ai giải v trùi

\(\dfrac{5\left(4+\sqrt{11}\right)}{\left(4+\sqrt{11}\right)\left(4-\sqrt{11}\right)}+\dfrac{3-\sqrt{7}}{\left(3+\sqrt{7}\right)\left(3-\sqrt{7}\right)}-\dfrac{6\left(\sqrt{7}+2\right)}{\left(\sqrt{7}-2\right)\left(\sqrt{7}+2\right)}-\dfrac{\sqrt{7}-5}{2}\)\(=\dfrac{\left(4+\sqrt{11}\right)5}{16-11}+\dfrac{3-\sqrt{7}}{9-7}-\dfrac{6\left(\sqrt{7}+2\right)}{7-4}-\dfrac{\sqrt{7}-5}{2}\)

\(=4+\sqrt{11}-\dfrac{3-\sqrt{7}}{2}-2\left(\sqrt{7}+2\right)-\dfrac{\sqrt{7}-5}{2}=\dfrac{8+2\sqrt{11}-3+\sqrt{7}-4\sqrt{7}-8-\sqrt{7}+5}{2}=\dfrac{2\sqrt{11}-4\sqrt{7}+2}{2}=1+\sqrt{11}-2\sqrt{7}\)

Bài 2:

a: \(A=\dfrac{15\sqrt{x}-11}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}-\dfrac{\left(3\sqrt{x}-2\right)\left(\sqrt{x}+3\right)}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}-\dfrac{\left(2\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}\)

\(=\dfrac{15\sqrt{x}-11-3x-9\sqrt{x}+2\sqrt{x}+6-2x+2\sqrt{x}-3\sqrt{x}+3}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}\)

\(=\dfrac{-5x+7\sqrt{x}-2}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}\)

\(=\dfrac{-5\sqrt{x}+1}{\sqrt{x}+3}\)

b: Để A=1/2 thì \(\dfrac{-5\sqrt{x}+1}{\sqrt{x}+3}=\dfrac{1}{2}\)

\(\Leftrightarrow-10\sqrt{x}+2=\sqrt{x}+3\)

hay \(x\in\varnothing\)