1 B

2 D

3 C

4 A

5 C

6 C

7 B

8 A

9 B

10 C

\(\dfrac{27}{35}\):\(\dfrac{9}{7}\)=\(\dfrac{3}{5}\).

\(\dfrac{27}{35}\div\dfrac{9}{7}=\dfrac{27}{35}\times\dfrac{7}{9}=\dfrac{3}{5}\) 

` 27/35 : 9/7 = 27/35 . 7/9 = 3/5`

Đặt \(2017-x=m,2019-x=n\)

\(\rightarrow m+n=2x-4036\)

Phương trình ban đầu trở thành :

\(m^3+n^3=\left(m+n\right)^3\)

\(\rightarrow3mn.\left(m+n\right)^3=0\)

\(\rightarrow\left(2017-x\right)\left(2019-x\right)\left(2x-4036\right)=0\)

\(\rightarrow\left[{}\begin{matrix}x=2017\\x=2018\\x=2019\end{matrix}\right.\)

Vậy \(S=\left\{2017;2018;2019\right\}\)

(2017-X)³+(2019-X)³+(2X-4036)³=0

<=>(2017-x).(2018-x).(2019-x)=0

<=>x=2017

x=2018

x=2019

#YQ

There are four people in my family : my parents , my brother and I . My father is forty-four years old. He is a worker in Truong Hai company. He is a jovial man who always tell many funny stories to make us smile. My father likes gardening very much as well as watching Tv programs. Unlike most men , my father likes cooking and he cooks very well. My mother is at the same age as my father.My mothers is also a worker . She likes cooking and traveling too, so whenever my parents have free time, we go some place interesting to relax . It's a great time. My brother is eight years old. He studies in primary school. He is interested in computer games and sports like football .I am now in my final year at the secondary school and in my attempt to win a place at university , i am under a lot of study pressure .However , being the eldest child and the only daughter in my family I try to help with the household chores such as wash the dishes , mop the floor and so on . Members of our family have very close relationships with each other . We often share our feelings, and whenever problems come up , we discuss them frankly and find solutions quickly. In sum , My family is important to me .I love my family very much

giá trị lớn nhất là 4 tin mình đi, mình làm rồi, chúc bạn thành công