năm cũ r

ồ vậy cố gắn lên bro

\(a,ĐK:x>0;x\ne1\\ A=\dfrac{\sqrt{x}+1}{\sqrt{x}\left(\sqrt{x}-1\right)}\cdot\dfrac{\left(\sqrt{x}-1\right)^2}{\sqrt{x}+1}=\dfrac{\sqrt{x}-1}{\sqrt{x}}\\ b,A>0\Leftrightarrow\sqrt{x}-1>0\left(\sqrt{x}>1\right)\\ \Leftrightarrow x>1\)

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

is-have watched

was

wasn't

did-come

do-get

studies-don't think

was

are your children

rang - stopped

closes

spends

studies

đăng r hạn chế đăng lại nhé, mình đã làm r mà 

https://hoc24.vn/cau-hoi/.2544202076135

a: \(=\dfrac{3}{4}\left(5+\dfrac{2}{3}-\dfrac{2}{3}\right)+\dfrac{1}{4}\)

\(=\dfrac{3}{4}\cdot5+\dfrac{1}{4}=\dfrac{15}{4}+\dfrac{1}{4}=4\)

lâm ơi chưa biết nó kể về cái gì sao làm bài

Ex2 :

1. Phong said he wanted some coffee

2. Nam and Minh said they take a taxi to there

4. My mother asked me I was doing my homework.

5. I asked him what he was name

???

lx 

\(A=\dfrac{7}{19}\times\dfrac{8}{11}+\dfrac{7}{19}\times\dfrac{3}{11}+\dfrac{12}{19}\)

\(=\dfrac{7}{19}\left(\dfrac{8}{11}+\dfrac{3}{11}\right)+\dfrac{12}{19}\)

\(=\dfrac{7}{19}+\dfrac{12}{19}=\dfrac{19}{19}=1\)

a: \(A=\dfrac{7}{19}\left(\dfrac{8}{11}+\dfrac{3}{11}\right)+\dfrac{12}{19}=\dfrac{7}{19}+\dfrac{12}{19}=1\)

b: \(B=\left(\dfrac{67}{111}+\dfrac{2}{33}-\dfrac{5}{117}\right)\cdot\dfrac{4-3-1}{12}=0\)

\(b\)

B nhé

b: \(B=\dfrac{x-2\sqrt{x}+1-x-2\sqrt{x}-1}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)}\cdot\dfrac{1}{\sqrt{x}}=\dfrac{-4}{x-1}\)