tìm x

\(x^2-2x-3\)

\(\left(\dfrac{1}{\sqrt{1+a}}+\sqrt{1-a}\right):\left(\dfrac{1}{\sqrt{1-a^2}}+1\right)\)

a, Tìm TXD

b, Rút gọn

\(x+2y+2\sqrt{xy}-10\sqrt{x}-16\sqrt{y}+34=0\)

\(\sqrt{4-\sqrt{7}}-\sqrt{4+\sqrt{7}}\)

Nêu thi chuyên 1 môn ngoài Văn Toán Anh thì 1 THi đề chuyên văn toán anh + đề môn chuyên 2 THi đề thường văn toán anh + đề môn chuyên E ở Hà Tĩnh ạ

Cho tam giác NPQ , vuông tại N , NK vuông góc PQ , NK=4  KP=2

a, tính góc Q

b, Tính NP và NQ

1 they think that he stole bike -> it

2 they exped more than 100.000 people will attend the festival ->

3 people have reported that Thien Duong is the long cave in Vietnam -> It has been

4, people bilieve that perfure pagoda was built during the reigh of Le Thanh Tong in the 15th ->

5 people say HLB is one of the most natural wonders you will ever see ->It

6 people hope many defensive measure will be taken ->

7 They know that the Earth is round not squirrel -.

8 people expect that there will be not storm this year -> It

9 they said that their team lost the important match -> I was been

10 people believe the best time to visit Hue is in Apri

\(2\sqrt{\left(2-\sqrt{5}\right)^2}-\dfrac{8}{3-\sqrt{5}}\)

\(\dfrac{5+3\sqrt{5}}{\sqrt{5}+3}-\dfrac{3+\sqrt{3}}{\sqrt{3}+1}\)

\(\dfrac{2+\sqrt{2}}{\sqrt{2}}-\dfrac{1}{2-\sqrt{22}}\)

RÚT GỌN BIỂU THỨC=)))

\(\left(\dfrac{2\sqrt{x}-4}{x-4\sqrt{x}+4}-\dfrac{\sqrt{x}-1}{x-1}\right).\dfrac{\sqrt{x}+4}{x-2\sqrt{x}}\)

Rút gon biểu thức