Cho bthuc: \(A=\frac{1}{2\sqrt{x}-2}-\frac{1}{2\sqrt{x}+2}+\frac{\sqrt{x}}{1-x}\)

a) Rut gon A

b) Tim gia tri cua x de /A/ =\(\frac{1}{2}\)

c) Tim x nguyen de A co gia tri nguyen

1) Cho bieu thuc: \(B=\left(\frac{\sqrt{x}}{\sqrt{x}+4}+\frac{4}{\sqrt{x}-4}\right):\frac{x+16}{\sqrt{x}+2}\left(x\ge0,x\ne16\right)\)

a) Cho bieu thuc A= \(\frac{\sqrt{x}+4}{\sqrt{x}+2}\) ; voi cac cua bieu thuc A va B da cho, hay tim cac gia tri cua x nguyen de gia tri cua bieu thuc B(A;-1) la so nguyen

a)Tim so nguyen x va y biet :

5/x+y/4=1/8

b)Tim so nguyen x de A co gia tri la 1 so nguyen biet :

A=(căn x +1) /(căn x -3) (x lớn hơn hoặc bằng 0)

tim so nguyen x de 2n+1/x-3 co gia tri la 1 so nguyen

Cho cac bieu thuc :

\(A=\dfrac{\sqrt{x}+4}{\sqrt{x}+2},B=\left(\dfrac{\sqrt{x}}{\sqrt{x}+4}+\dfrac{4}{\sqrt{x}-4}\right):\dfrac{x+16}{\sqrt{x}+2}\)

a) Rut gon B ?

b) Tim cac gia tri nguyen cua x de cac gia tri cua bieu thuc B(A-1) la so nguyen.

cho bieu thuc C =\(\left(\frac{x-\sqrt{x}}{\sqrt{x}-1}+1\right):\left(\frac{x+\sqrt{x}}{\sqrt{x}+1}\right)\)

a. tim dieu kien de C co nghia ?

b.rut gon C ?

c. tinh C tai x=\(\frac{4}{9}\)

d. tim x de C= 5

e.tim gia tri x nguyen de C co gia tri nguyen

bai 1

cho bieu thuc A = 5/n+1 voi N THUOC Z

a, de A la phan so thi n co dieu kien gi ?

b , tim tat ca cac gia tri nguyen cua n de gia tri A la 1 so nguyen ?

bai 2

cho bieu thuc M = 6/n-3 voi n thuoc Z .Co bao nhieu gia tri cua n de :

a, M ko phai la phan so

b , M la phan so va cp gia tri nguyen ?

bai 3 viet tap hop cacs so nguyen sao cho :

-12/4 < x <6/3

A=n-1/n+2

a, Voi gia tri nao thi A la phan so

b, Tim so nguyen n de A=0

c,tim so nguyen n de A co gia tri nguyen

goi A  la tap hp cac so nguyen duong x sao cho gia tri cua bieu thuc :\(\frac{2\sqrt{x}+3}{\sqrt{x}-1}\) nguyen