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Ko đăng linh tinh nữa

làm hết à

daps an : C

thì thi đi

cho tới vòng 20 lun

nhanh lên

nếu ko ko dc thi đó

Zậy cũng ns nữa hả

nhưng họ ko cho thi

\(a,\frac{7}{x}=\frac{x}{28}=>x\cdot x=28\cdot7=>x^2=196=>x^2=14^2\)\(=>x=14\)

\(b,\frac{10+x}{x+17}=\frac{3}{4}=>\left(10+x\right)\cdot4=\left(x+17\right)\cdot3=>40+x4=x3+51\)\(=>x4-x3=51-40=>x=11\)

First, I am going to visit Ha Long Bay for two days

Then, I am going to see Ngoc Son Temple in Ha Noi for a week

Next, I am going to visit Hue for a week.

After that, I am going to see the citadel

Next, I am going to stay at a friend's house in Nha Trang for three days

Then, I am going to stay with their uncle in Ho Chi Minh City for a week

After that, I am going to visit the beach and swim in Nha Trang

Next, I am going to visit my friend

Then, I am going to see a movie

After that, I am going to wath a soccer match

phần nào bạn?

2x−92402x−9240=39803980⇒⇒2x−92x−9=240.3980240.3980=117117

2x−9=1172x−9=117⇒⇒2x=117+9=1262x=117+9=126⇒⇒x=126:2=63

Ta có 2x–9/240=39/80=117/240. suy ra 2x – 9 = 117

Từ đó tìm được x = 63 

\(2.x-\frac{9}{240}=\frac{39}{80}\)

\(\frac{39}{80}=\frac{117}{240}\)

\(\Rightarrow2.x-\frac{9}{240}=\frac{117}{240}\)

\(\Rightarrow2.x-9=117\)

\(\Rightarrow2x=126\)

\(\Rightarrow126:2=63\)

Vậy: x = 63