\(\sqrt{x+\dfrac{3}{x}}-2=\dfrac{x^2+7}{2\left(x+1\right)}-2\)
\(\Leftrightarrow\dfrac{x+\dfrac{3}{x}-4}{\sqrt{x+\dfrac{3}{x}}+2}=\dfrac{x^2-4x+3}{2\left(x+1\right)}\)
\(\Leftrightarrow\dfrac{x^2-4x+3}{x\left(\sqrt{x+\dfrac{3}{x}}+2\right)}=\dfrac{x^2-4x+3}{2\left(x+1\right)}\)
......
giải hệ phương trình
\(\left\{{}\begin{matrix}\sqrt{x-2}+\sqrt{y-3}=3\\2\sqrt{x-2}-3\sqrt{y-3}=-4\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\dfrac{3x}{x+1}+\dfrac{2}{y+4}=4\\\dfrac{2x}{x+1}-\dfrac{5}{y+4}=4\end{matrix}\right.\)
Giải phương trình \(\dfrac{3\left(x-\sqrt{3}\right)\left(x-\sqrt{5}\right)}{\left(1-\sqrt{3}\right)\left(1-\sqrt{5}\right)}+\dfrac{4\left(x-1\right)\left(x-\sqrt{5}\right)}{\left(\sqrt{3}-1\right)\left(\sqrt{3}-\sqrt{5}\right)}+\dfrac{5\left(x-1\right)\left(x-\sqrt{3}\right)}{\left(\sqrt{5}-1\right)\left(\sqrt{5}-\sqrt{3}\right)}=3x-2\)
1. giải phương trình bậc hai một ẩn
a, 3x2+7x+2=0
b,\(\dfrac{x^2}{3}+\dfrac{4x}{5}-\dfrac{1}{12}\)=0
c\(\left(5-\sqrt{2}\right).x^2-10x+5x+\sqrt{2}=0\)
d,(x-1)(x+2)=70
Giải các phương trình sau:
1. \(\sqrt{x^2-\dfrac{1}{4}+\sqrt{x^2+x+\dfrac{1}{4}}}=\dfrac{1}{2}\left(2x^3+x^2+2x+1\right)\)
2. \(x^2+4x+7=\left(x+4\right)\sqrt{x^2+7}\)
3. \(\sqrt{x-1}+\sqrt{x^3+x^2+x+1}=1+\sqrt{x^4-1}\)
4. \(\sqrt{x^2-3x+2}+\sqrt{x+3}=\sqrt{x-2}+\sqrt{x^2+2x-3}\)
5. \(x=\left(\sqrt{x}+2\right)\left(1-\sqrt{1-\sqrt{x}}\right)\)
6. \(2\sqrt[3]{2x-1}=x^3+1\)
7. \(\sqrt{x-\dfrac{1}{x}}+\sqrt{1-\dfrac{1}{x}}=x\)
Giải phương trình: \(\sqrt{\dfrac{x^2+3}{x}}=\dfrac{x^2+7}{2\left(x+1\right)}\).
Giải phương trình:
\(\sqrt{x+\dfrac{3}{x}}=\dfrac{x^2+7}{2\left(x+1\right)}\)
Giải phương trình:
1. \(\sqrt{2x^2+4x+7}=x^4+4x^3+3x^2-2x-7\)
2. \(\dfrac{4}{x}+\sqrt{x-\dfrac{1}{x}}=x+\sqrt{2x-\dfrac{5}{x}}\)
3. \(\dfrac{6-2x}{\sqrt{5-x}}+\dfrac{6+2x}{\sqrt{5+x}}=\dfrac{8}{3}\)
4. \(x^2+1-\left(x+1\right)\sqrt{x^2-2x+3}=0\)
5. \(2\sqrt{2x+4}+4\sqrt{2-x}=\sqrt{9x^2+16}\)
6. \(\left(2x+7\right)\sqrt{2x+7}=x^2+9x+7\)
Giải hệ phương trình sau: \(\left\{{}\begin{matrix}\sqrt{\dfrac{x}{y}}+\sqrt{\dfrac{y}{x}}=\dfrac{5}{2}\\x+y-5=0\end{matrix}\right.\)
giải các phương trình sau:
a)\(\left(\sqrt{x+1}+1\right)^3+2\sqrt{x-1}=2-x\)
b)\(x^3=x^4+x^3+x^2+x+2\)
c)\(2\left(x^2+x+1\right)^2-7\left(x-1\right)^2=13\left(x^3-1\right)\)
d)\(8x^2+\sqrt{\dfrac{1}{x}}=\dfrac{5}{2}\)
