Rút gọn các biểu thức sau
a,\(A=\left(\dfrac{1}{x-\sqrt{x}}+\dfrac{1}{\sqrt{x}-1}\right):\dfrac{\sqrt{x}+1}{x-2\sqrt{x}+1}\)
b,\(B=\dfrac{2\sqrt{x}-1}{\sqrt{x}+1}+\dfrac{3\sqrt{x}-1}{x-\sqrt{x}+1}-\dfrac{2x\sqrt{x}-2x+2\sqrt{x}-3}{x\sqrt{x}+1}\)
c,\(C=\left(1-\dfrac{x+3\sqrt{x}}{x-9}\right):\left(\dfrac{\sqrt{x}-3}{2-\sqrt{x}}+\dfrac{\sqrt{x}-2}{3+\sqrt{x}}-\dfrac{9-x}{x+\sqrt{x}-6}\right)\)
d,\(D=\left(\dfrac{\sqrt{x}}{3+\sqrt{x}}+\dfrac{x+9}{9-x}\right):\left(\dfrac{3\sqrt{x}+1}{x-3\sqrt{x}}-\dfrac{1}{\sqrt{x}}\right)\)
e,\(E=\dfrac{15\sqrt{x}-11}{x+2\sqrt{x}-3}+\dfrac{3\sqrt{x}-2}{1-\sqrt{x}}-\dfrac{2\sqrt{x}+3}{\sqrt{x}+3}\)
Cho biểu thức:
\(M=\left(\frac{\sqrt{x}+1}{\sqrt{2x}+1}+\frac{\sqrt{2x}+\sqrt{x}}{\sqrt{2x}-1}-1\right)\)\(:\left(1+\frac{\sqrt{x}+1}{\sqrt{2x}+1}-\frac{\sqrt{2x}+\sqrt{x}}{\sqrt{2x}-1}\right)\)
a/ Rút gọn M
b/ Tính M khi \(x=\frac{1}{2}\left(3+2\sqrt{2}\right)\)
Rút gọn \(\left(\frac{1}{\sqrt{x}-\sqrt{x}-1}-\frac{x-3}{\sqrt{x}-1-\sqrt{2}}\right)\left(\frac{2}{\sqrt{2}-\sqrt{x}}-\frac{\sqrt{x}+\sqrt{2}}{\sqrt{2x}-x}\right)\)
\(A=\left(\dfrac{1}{1-\sqrt{x}}-\dfrac{1}{\sqrt{x}}\right):\left(\dfrac{2x+\sqrt{x}-1}{1-x}+\dfrac{2x\sqrt{x}+x-\sqrt{x}}{1+x\sqrt{x}}\right)\)
a) Rút gọn biểu thức
b) Tính GTBT A khi x = 17 - 12√2
Cho biểu thức:
\(M=\left(\frac{\sqrt{x}+1}{\sqrt{2x}+1}+\frac{\sqrt{2x}+\sqrt{x}}{\sqrt{2x}+1}-\frac{\sqrt{2x}+\sqrt{x}}{\sqrt{2x}-1}\right)\)
a/ Rút gọn M
b/ Tính M khi \(x=\frac{1}{2}\left(3+2\sqrt{2}\right)\)
B1: tính : A = \(\sqrt{7+4\sqrt{3}}\) + \(\sqrt{7-4\sqrt{3}}\)
B2: cho P= 3x-\(\sqrt{x^2-10x+25}\)
a, rút gọn P
b, tính P khi x=2
B3: rút gọn : M = \(\dfrac{\sqrt{x^2-2x+1}}{x-1}\)với x khác 1
giúp em zới ạ em cảm mơn nhìu nhìu
Cho biểu thức: B = \(\left(\frac{8x\sqrt{x}-1}{2x-\sqrt{x}}-\frac{8x\sqrt{x}+1}{2x+\sqrt{x}}\right):\frac{2x+1}{2x-1}\) \(\left(x\ge0;x\ne\pm\frac{1}{2}\right)\)
Rút gọn B
\(A=\frac{x-2\sqrt{x}}{x\sqrt{x}-1}+\frac{\sqrt{x}+1}{x\sqrt{x}+x+\sqrt{x}}+\frac{1+2x-2\sqrt{x}}{x^2-\sqrt{x}}\)
a)Rút gọn A
b)Tìm x để A nguyên
rút gọn
\(\frac{x^2+\sqrt{x}}{x-\sqrt{x} +1}+1-\frac{2x+\sqrt{x}}{\sqrt{x}}\) vs x>0