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Đặt \(130307=a;\text{ }140307=b\)
Pt trở thành \(\sqrt{a+b\sqrt{x+1}}=1+\sqrt{a-b\sqrt{x+1}}\)
\(\Leftrightarrow\sqrt{a+b\sqrt{x+1}}-\sqrt{a-b\sqrt{x+1}}=1\)
\(\Leftrightarrow a+b\sqrt{x+1}+a-b\sqrt{x+1}-2\sqrt{\left(a+b\sqrt{x+1}\right)\left(a-b\sqrt{x+1}\right)}=1\)
\(\Leftrightarrow2a-1=2\sqrt{a^2-b^2\left(x+1\right)}\)
\(\Leftrightarrow\left(2a-1\right)^2=4\left[a^2-b^2\left(x+1\right)\right]\)
\(\Leftrightarrow x+1=\frac{\left(2a-1\right)^2-4a^2}{-4b^2}\)
\(\Leftrightarrow x=\frac{4a^2-\left(2a-1\right)^2}{4b^2}-1\)
ĐKXĐ : \(\left\{{}\begin{matrix}-130307\le140307\sqrt{1+y}\\130307\ge140307\sqrt{1+y}\end{matrix}\right.\)
\(\Leftrightarrow\sqrt{1+y}\le\dfrac{130307}{140307}\) và \(y\ge-1\)
\(PT\Leftrightarrow140307\sqrt{1+y}=-140307\sqrt{1+y}\)
\(\Leftrightarrow\)\(\sqrt{1+y}=0\)
\(\Leftrightarrow y=-1\) ( TM )
Vậy ...
\(\sqrt{x}-\sqrt{x+1}-\sqrt{x+4}+\sqrt{x+9}=0;ĐK:x\ge4\)
\(\Leftrightarrow\sqrt{x}+\sqrt{x+9}=\sqrt{x+1}-\sqrt{x+4}\)
\(\Leftrightarrow2x+9+2\sqrt{x^2+9x}=2x-5+2\sqrt{x^2-5x+4}\)
\(\leftrightarrow14+2\sqrt{x^2+9x}=2\sqrt{x^2-5x+4}\leftrightarrow7+\sqrt{x^2+9x}=\sqrt{x^2-5x+4}\)
\(\leftrightarrow49+14\sqrt{x^2+9x}+x^2+9x=x^2-5x+4\)
\(\leftrightarrow14\sqrt{x^2+9x}=-14x-45\)
\(\leftrightarrow\hept{\begin{cases}196.x^2+9x=196x^2+1260x+2025\\-14x-45\ge0\end{cases}}\Leftrightarrow\hept{\begin{cases}504x=2025\\x\le\frac{-45}{14}\end{cases}\leftrightarrow x=\frac{225}{56}}\) loại
-> PT vô nghiệm
Áp dụng BĐT:\(\left|A\right|+\left|B\right|\ge\left|A+B\right|\)
Ta có: \(\left|\sqrt{x-1}+2\right|+\left|3-\sqrt{x-1}\right|\ge\left|\sqrt{x-1}+2+3-\sqrt{x-1}\right|=5\)
Dấu \(=\)xảy ra khi \(AB\ge0\)
dat \(\sqrt{x-1}\) = t
ta có: \(\sqrt{x+3+4t}\)+ \(\sqrt{x+8-6t}\)= 5
x + 3 + 4t + x + 8 - 6t = 25
2x - 2t = 14 ( chia cả 2 vế cho 2)
x - t = 7
t = x - 7
thay t = \(\sqrt{x}-1\)vào ta được:
x - 7 = \(\sqrt{x-1}\)
( x - 7 )2 = x - 1
x2 -14x + 49 = x - 1
x2 - 15x + 50 = 0
k biết đúng hay k
\(\Leftrightarrow\left(\sqrt{1-x}-\sqrt{2+x}\right)^2=1\Leftrightarrow1-x-2\sqrt{\left(1-x\right)\left(2+x\right)}+2+x=1\)
\(\Leftrightarrow3-2\sqrt{\left(1-x\right)\left(2+x\right)}=1\Leftrightarrow2\sqrt{\left(1-x\right)\left(2+x\right)}=2\)
\(\Leftrightarrow\sqrt{-x^2-x+2}=1\Leftrightarrow-x^2-x+2=1\Leftrightarrow-x^2-x+1=0\)
\(\Leftrightarrow-\left(x^2+2.\frac{1}{2}.x+\frac{1}{4}\right)+\frac{5}{4}=0\Leftrightarrow\left(x+\frac{1}{2}\right)^2=\frac{5}{4}\Leftrightarrow\orbr{\begin{cases}x+\frac{1}{2}=-\frac{\sqrt{5}}{2}\\x+\frac{1}{2}=\frac{\sqrt{5}}{2}\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}x=\frac{-\sqrt{5}-1}{2}\\x=\frac{\sqrt{5}-1}{2}\end{cases}}\)