=> (x+3)(x+9)=(x-4)(x+2)
=> (x+3)(x+9)-(x-4)(x+2)=0
=> x2+12x+27-x2+2x+8=0
=> 14x+35=0
=> 14x=-35
=> x=-35:14
=> x=-2,5
=> (x+3)(x+9)=(x-4)(x+2)
=> (x+3)(x+9)-(x-4)(x+2)=0
=> x2+12x+27-x2+2x+8=0
=> 14x+35=0
=> 14x=-35
=> x=-35:14
=> x=-2,5
Giải pt: \(\frac{3+x}{3x}=\sqrt{\frac{1}{9}+\frac{1}{x}\sqrt{\frac{4}{9}+\frac{2}{x^2}}}\)
Giải PT:
\(\frac{6}{x^2-9}+\frac{4}{x^2-11}-\frac{7}{x^2-8}-\frac{3}{x^2-12}=0\)
Giải pt: \(\frac{x^2}{3+\sqrt{9-x^2}}+\frac{1}{4\left(3-\sqrt{9-x^2}\right)}=1\)
GIẢI PT \(3\left(\frac{x+3}{x-2}\right)^2+168\left(\frac{x-3}{x+2}\right)^2-46\frac{x^2-9}{x^2-4}=0\)
giải pt
\(\frac{x+1}{x-1}+\frac{x-2}{x+2}+\frac{x-3}{x+3}+\frac{x+4}{x-4}=4\)
Giải pt: \(\frac{x+1}{x-1}+\frac{x-2}{x+2}+\frac{x-3}{x+3}+\frac{x+4}{x-4}=4\)
Giải pt sau :\(\frac{25}{x}+9\sqrt{9x^2-4}=\frac{2}{x}+\frac{18}{x^2+1}\)
B2: Cho x;y >0 .Tìm min \(B=\left(3+\frac{1}{x}\right)\left(3+\frac{1}{y}\right)\left(2+x+y\right)\)
Giải PT \(\left(x-\frac{9}{2}\right)^4+\left(x-\frac{11}{4}\right)^4=1\)
giải các pt sau
\(\frac{3}{\sqrt{x}+15}=\frac{\sqrt{x}}{5}\)
\(\frac{x+2\sqrt{x}+1}{\sqrt{x}}=\frac{9}{2}\)