Cho A=x/(√x -1) - (2x - √x)/(x-√x)
rut gon bt A
tinh gia tri cua bt A tai x=3+2√2
cho A=x+7√xx+7x; B=√x√x+3xx+3+2√x−1√x−32x−1x−3-2x−√x−3x−92x−x−3x−9
a, tinh A khi x=16
b, rut gon B
c,tim Min cua p=A+1/B
Cho A=2√x+x\x√x-1 - 1\√x-1 , B=√x+2\x+√x+1 (₫k x lon hon hoac = 0, x khac 9)
a, Tinh B khi x=25
b, Rut gon A
c, Tim x de C=2A:B€Z
Cac ban trinh bay day du giup mk nha.
Bai nao trinh bay dep nhat mk se tick cho nha
A=x-Vx-2/x-1 + 1/Vx-1 - 1/Vx+1
a Rut gon A
b Tinh gia tri cua A khi x=2/V2-1 -2/V2-z
rut gon roi tinh gia tri cua x de A=-1
\(\sqrt{2}-\sqrt{x+2\sqrt{2x-4}}\)
Cho bieu thuc:
P=\(\frac{1}{\sqrt{x}+2}-\frac{5}{x-\sqrt{x}-6}-\frac{\sqrt{x}-2}{3-\sqrt{x}}\)
a. Rut gon bieu thuc P
b.Tim GTLN cua P sau khi rut gon
cho P=\(\left(2-\frac{\sqrt{x}-1}{2\sqrt{x}-3}\right):\left(\frac{6\sqrt{x}+1}{2x-\sqrt{x}-3}+\frac{\sqrt{x}}{\sqrt{x}+1}\right)\\ \)
a, rut gon P
b, tinh gia tri cua P khi \(x=\frac{3-2\sqrt{2}}{4}\)
c, so sanh P voi \(\frac{3}{2}\)
Rut gon bieu thuc A=\(\sqrt{x+\sqrt{2x-1}}-\sqrt{x-\sqrt{2x-1}}\)
\(A=\frac{\sqrt{x}-1}{^{^2x-x}}:\left(\frac{1}{\sqrt{X}}-\frac{1}{\sqrt{X}+1}\right)\)rut gon a
