\(x\) : 100 + \(x\) x 3,99 = 4,8

\(x\)x 0,01 + \(x\)x 3,99 = 4,8

\(x\)x ( 0,01 + 3,99 )      = 4,8

\(x\)x 4                           = 4,8

\(x\)                               = 4,8 : 4

\(x\)                               = 1,2

\(\frac{x}{100}+3,99x=x\cdot0,01+3,99x\) =4,8

<=> \(x\left(0,01+3,99\right)=\)4,8

<=> 4x = 4,8

=>  x= \(\frac{4,8}{4}=1,2\)

x : 100 + x x 3,99 = 4,8

<=> x x 1/100 +x x 3,99 = 4,8

<=> x x ( 1/100 + 3,99 ) = 4,8

<=> x x 4 = 4,8

<=> x = 4,8 : 4

<=> x = 1,2

Vậy x = 1,2

1 She said that she was coming 

2 She said that she wouldn't see me the following day 

3 She said that he worked in a bank 

4 She said that he was living in Paris for a few months

5 Lan said that she would be very busy the next day 

6 Thu said that all the students would have a meeting the following sunday 

7 Tam said that she could swim acroos that river 

8 His sister said that she didn't buy that book 

9 The boy said that they had to try their best to win the match 

10 Her father said to her that she could go to the movies with her friends 

11 Her classmate said that Lan was the most intellligent girl in their class 

12 The teacher said that the sun rised in the east

Khoảng cách giữa các phân số là:

2/13- 1/13= 1/13

Tổng có số số hạng là:

( 11/13- 1/13)/ 1/13+ 1= 11

Tổng là:

( 1/13+ 11/13)* 11/ 2= 66/13

Đáp số: 66/13.

\(\frac{1}{13}+\frac{2}{13}+\frac{3}{13}+...+\frac{11}{13}\)   =  \(\frac{1+2+3+...+11}{13}\)

Xét TS : 1 + 2 + 3 + ... + 10 + 11

      Có số số hạng là :

           ( 11 - 1 ) : 1 +1 = 11 ( số )

       Giá trị của TS là :

            ( 1 + 11 ) x 11 : 2 = 66 .

Vậy : \(\frac{1}{13}+\frac{2}{13}+\frac{3}{13}+...+\frac{10}{13}+\frac{11}{13}=\frac{66}{13}\)

Khoảng cách giữa các phân số là:

     2/13 - 1/13 = 1/13

Tổng có số số hạng là:

     ( 11/13 - 1/13 ) : 1/13 + 1 = 11 

Tổng là:

     ( 1/13 + 11/13 ) x 11/2 = 66/13

            Đáp số: 66/13

going

has

some

the

very

here

i think the health is very important for many people.Because it helps many people comfortable and fun.Beside you will protect your body from environment and change weather.It also helps you not tired , bored ....you should protect your healthy by : if you go out,you should wear warm clothers , don't wear shorts clothers in cold weather....finnally, health is very very important 

My brother didn't use to work hard when he was in university.

Despite being the boss, she works as hard as her employees.

Where did you go on holiday ?

where did you go on holiday?

_Where did you go on holiday?

help me

\(a,\dfrac{-3}{7}-x=\dfrac{8}{9}\\ =>x=-\dfrac{3}{7}-\dfrac{8}{9}\\ =>x=-\dfrac{83}{63}\)

\(b,\left(\dfrac{3}{10}-x\right):\dfrac{2}{5}=\dfrac{3}{5}\\ =>\dfrac{3}{10}-x=\dfrac{3}{5}\text{×}\dfrac{2}{5}=\dfrac{6}{25}\\ =>x=\dfrac{3}{10}-\dfrac{6}{25}=\dfrac{3}{50}\)

a: =>x=-3/7-8/9=-83/63

b: \(\Leftrightarrow\left(\dfrac{3}{10}-x\right)=\dfrac{3}{5}:\dfrac{2}{5}=\dfrac{3}{2}\)

=>x=3/10-3/2=-6/5

c: \(\Leftrightarrow\left(x-\dfrac{1}{2}\right)^2=4\)

=>x-1/2=2 hoặc x-1/2=-2

=>x=5/2 hoặc x=-3/2

d: =>1/8x+1/2=5/2-3/4=10/4-3/4=7/4

=>1/8x=7/4-1/2=5/4

=>x=10

\(a:\dfrac{-3}{7}-x=\dfrac{8}{9}\\ x=\dfrac{-3}{7}-\dfrac{8}{9}\\ x=-\dfrac{83}{63}\\ b:\left(\dfrac{3}{10}-x\right):\dfrac{2}{5}=\dfrac{3}{5}\\ \dfrac{3}{10}-x=\dfrac{3}{5}\cdot\dfrac{2}{5}\\ \dfrac{3}{10}-x=1\\ x=\dfrac{3}{10}-1\\ x=-\dfrac{7}{10}\\ c:\dfrac{1}{36}\cdot\left(x-\dfrac{1}{2}\right)^2=\dfrac{1}{9}\\ \left(x-\dfrac{1}{2}\right)^2=\dfrac{1}{9}:\dfrac{1}{36}\\ \left(x-\dfrac{1}{2}\right)^2=4\\ \left(x-\dfrac{1}{2}\right)^2=2^2;-2^2\\ x-\dfrac{1}{2}=2\\ x=2+\dfrac{1}{2}\\ x=\dfrac{5}{2}\\ x-\dfrac{1}{2}=-2\\ x=-2+\dfrac{1}{2}\\ x=-\dfrac{3}{2}\\ x=\left\{\dfrac{5}{2};-\dfrac{3}{2}\right\}\)