\(\dfrac{\sqrt{x}}{\sqrt{x-1}}+\dfrac{3}{\sqrt{x+1}}-\dfrac{6}{\sqrt{x-1}}\)
\(=\dfrac{\sqrt{x}-6}{\sqrt{x-1}}+\dfrac{3}{\sqrt{x+1}}\)
\(=\dfrac{\left(\sqrt{x}-6\right)\left(\sqrt{x+1}\right)+3\sqrt{x-1}}{\sqrt{\left(x-1\right)\left(x+1\right)}}\)
\(=\dfrac{\sqrt{x^2+x}-6\sqrt{x+1}+3\sqrt{x-1}}{\sqrt{\left(x-1\right)\left(x+1\right)}}\)
a : \(\dfrac{x}{x-4}+\dfrac{1}{\sqrt{x}-2}+\dfrac{1}{\sqrt{x}+2}\)với a ≥ 0 x ≠ 4
b : \(\left(\dfrac{1}{\sqrt{x}}+\dfrac{\sqrt{x}}{\sqrt{x}+1}\right).\dfrac{\sqrt{x}}{x+\sqrt{x}}\)
c : \(\dfrac{\sqrt{x}}{\sqrt{x}-1}+\dfrac{3}{\sqrt{x}+1}-\dfrac{6\sqrt{x}-4}{x-1}\)
d : \(\left[\dfrac{a+3\sqrt{a}+2}{\left(\sqrt{a}+2\right)\left(\sqrt{a}-1\right)}-\dfrac{a\sqrt{a}}{a-1}\right]:\left(\dfrac{1}{\sqrt{a}-1}+\dfrac{1}{\sqrt{a}+1}\right)\)
Bài: Rút gọn biểu thức sau
1)(1-\(\dfrac{\sqrt{x}}{1-\sqrt{x}}\)):(\(\dfrac{\sqrt{x}+3}{\sqrt{x}-2}\)-\(\dfrac{\sqrt{x}+2}{3-\sqrt{x}}\)+\(\dfrac{\sqrt{x}+2}{x-5\sqrt{x}+6}\))
2)(\(\dfrac{1}{\sqrt{x}+1}\)-\(\dfrac{2\sqrt{x}-2}{x\sqrt{x}-\sqrt{x}+x-1}\)):(\(\dfrac{1}{\sqrt{x}-1}\)-\(\dfrac{2}{x-1}\))
Rút gọn các biểu thức sau:
A=\(\dfrac{2x+2}{\sqrt{x}}+\dfrac{x\sqrt{x}-1}{x-\sqrt{x}}-\dfrac{x\sqrt{x}+1}{x+\sqrt{x}}\)
B=\(\dfrac{2\sqrt{x}-9}{x-5\sqrt{x}+6}-\dfrac{\sqrt{x}+3}{\sqrt{x}-2}-\dfrac{2\sqrt{x}+1}{3-\sqrt{x}}\)
C=\(\left(\dfrac{x+\sqrt{x}-1}{x\sqrt{x}-1}-\dfrac{\sqrt{x}-1}{x+\sqrt{x}+1}\right):\dfrac{1}{\sqrt{x}-1}\)
Rút gọn biểu thức
\(\left(\dfrac{1}{\sqrt{x}+3}+\dfrac{1}{\sqrt{x}-3}\right).\dfrac{x-6\sqrt{x}+9}{\sqrt{x}}\)
\(\dfrac{x}{\sqrt{x}+1}+\dfrac{2x+\sqrt{x}}{x+\sqrt{x}}\)
Thu gọn P
\(P=\dfrac{x-\sqrt{x}}{x-9}+\dfrac{1}{\sqrt{x}+3}-\dfrac{1}{\sqrt{x}-3}\)
a) Tính P biết \(x=\sqrt{6+4\sqrt{2}}+\sqrt{6-4\sqrt{2}}\)
b) Tính P biết \(x=\dfrac{1}{\sqrt{2}-1}-\dfrac{1}{\sqrt{2}+1}\)
B=\(\dfrac{\sqrt{x}}{\sqrt{x}+3}+\dfrac{6}{\sqrt{x}-1}-\dfrac{\sqrt{x}+15}{x+2\sqrt{ }x}-3\) Chứng minh B=\(\dfrac{\sqrt{x}+1}{\sqrt{x}-1}\) giúp mik câu này vs ạ mik đang cần gấp
Rút gọn
\(\dfrac{6}{\sqrt{5}+1}+\sqrt{\dfrac{2}{3-\sqrt{5}}}-\dfrac{10}{\sqrt{5}}\)
B1. Với \(x\ge0,x\ne4.Chobiểuthức\)
\(A=\dfrac{x-9}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-2\right)}-\dfrac{1}{2-\sqrt{x}}-\dfrac{\sqrt{x}}{\sqrt{x}+3}\)
\(B=\dfrac{1}{x\sqrt{x}+27}\)
a, tính giá trị biểu thức khi B= 1/4
b, Rút gọn A
c, Tìm giá trị của x để A>1/2
d, Với C= B : A. Tìm GTLN C
Bài 1: Rút gọn biểu thức dạng chữ:
1) \(A=\dfrac{2\sqrt{x}+13}{x+5\sqrt{x}+6}+\dfrac{\sqrt{x}-2}{\sqrt{x}+2}-\dfrac{2\sqrt{x-1}}{\sqrt{x}+3}\) ( với \(x\ge0\))
2) \(A=\left(\dfrac{\sqrt{x}}{\sqrt{x}+3}+\dfrac{3}{\sqrt{x}-3}\right).\dfrac{\sqrt{3}+3}{x+9}\)( với x\(\ge0,\) x\(\ne9\))
Tìm điều kiện xác định và rút gọn biểu thức:
D=\(\dfrac{\sqrt{x}-2}{\sqrt{x}-3}-\dfrac{5}{x+\sqrt{x}-6}+\dfrac{1}{2-\sqrt{x}}\)
E=\(\left(\dfrac{\sqrt{x}+3}{\sqrt{x}+2}-\dfrac{2-\sqrt{x}}{3-\sqrt{x}}-\dfrac{\sqrt{x}-8}{x-\sqrt{x}-6}\right):\left(1-\dfrac{\sqrt{x}+6}{2\sqrt{x}+4}\right)\)
Tìm `ĐKXĐ`:
\(\sqrt{\dfrac{-5}{6+x}}\)
\(\sqrt{\dfrac{-2}{6-x}}\)
\(\sqrt{\dfrac{-x+3}{-6}}\)
\(\sqrt{\dfrac{7x-1}{-9}}\)
\(\sqrt{\dfrac{x+2}{x^2+2x+1}}\)
\(\sqrt{\dfrac{x-2}{x^2-2x+4}}\)
