My family have 4 people. There are my mother,my father,my elder sister and me.My parents are both the same age, 50 years old.My father is a teacher ,he is very kind and hard-working. My morther is a nurse, she is interesting, I think she is the most funny person in my family. My elder sister is 18 years old, she is a student and she is very pretty,she not only learns well but also plays the piano very well, I think she will become a pianist in the future. And me, I’m 16 years old and I’m a pupil, in the future i'll be a marketing staff. I love my familly very much.For me, family always is the assured a reliable support.

Hello every body ! My name is Duy . I am 14 years old . There are 5  people in my family : My father ; my mother ; my older sisters and me . My father is a doctor . He works a hospital in the city center . Every day , he go to work by bus . My mother is a teacher . She learns English at a school near my house . She walks to school every day . I have 2 elder sister . The oldest is a secretary in a company . The younger is a studente . She is learning at Hanoi university . I love my family so much . I feel very happy to be alive in this family.

                                                   My Family :

 As you know , all of us have a faimly.The family is the place we are brought up and look after everyday. Today , I would like to introduce my topic is " My Family"

 I come from a family of 4 people : my parents , my younger brother and me.

 My father is an engineer. He likes reading new spaper and watching TV.He teaches me many helpfull things in the life : know how to love everyone , how to behave well , how to keep clothes and schoolthings clean and tidy , ect .....But sometimes when I make mistakes , he is very strict but frankly my father is so kind and friendly.

 And my mother is a teacher.She is a good woman. She is very carefull.My mother cooks very well.My brother and I like eatiing her dishes very much especially fried chicken , and so on... My parents love me and my younger brother so much but they don't say.

 And my brother is a good student at Nguyen Ngoc Binh Primary School.He is a active boy in many activities as well as studying. When my brother and I have free time, we often play many many sports and games such as : badminton , volleyball , hide - and - seek , ect....

 And my name is Nhi. I'm a student at class 6/1 at Tran Phu Secondary School. I'm very good at English.

 When all the members in my family have free time , we usually talk about studying as well as working together.Also , I can have meats with my family.I'm so happy and really fun so much. At the weekend , we visit many places such as : park , zoo , beach , ....  I love all the people in my family.

 So being a member of my family , I will try my best to study well to become a good daughter . And my parents will be proud about me.

Bài 1

12+14+16+...+2016

Số các số hạng là

(2016-12):2+1=1003

Tổng là

(2016+12)x1003:2=1017042

Bài 2

Nửa chu vi gấp chiều dài là

3:2=1,5( lần chiều dài)

Chiều rộng bằng

1,5-1=0,5( lần chiều dài)

=> Tỉ số của chiều dài và chiều rộng là 2

Chiều dài là

35:(2-1)x2=70(m)

Chiều rộng là

70-35=35(m)

Chu vi là

(70+35)x2=210 (m)

Diện tích là

70x35=2450(m²)

ha ha ha ngu the

Các số chia cho 3 dư 1 theo thứ tự là: 4;7;10;.....;2011.

SSH ( số số hạng) là:

(2011 - 4) : 3 + 1 = 670 ( số)

TSSH( tổng số số hạng) là:

(2011 + 4) x 670 : 2 = 675025

Vậy, trung bình của các số chia cho 3 dư 1 là:

675025 : 670 = 1007,5

     Đ/số: 1007,5

* đây là theo cách tính của chị. Còn em muốn thế nào cũng được

Gọi số đó là a

0,25 = \(\frac{1}{4}\)

a : \(\frac{1}{4}\)- 1,5 = a x \(\frac{1}{4}\)+ 1,5

a x 4 - 1,5 = a x \(\frac{1}{4}\)+1,5

a x 4 - a x \(\frac{1}{4}\)= 1,5 + 1,5

a x \(\left(4-\frac{1}{4}\right)\)= 3

a x \(\frac{15}{4}\)= 3

\(a=3\div\frac{15}{4}\)

\(a=\frac{4}{5}=0,8\)

Đáp số : 0,8

Gọi số đó là a
ta có: a/0,25-1,5=a*0,25+1,5
         4a-0,25a=3
         3,75a=3
               a=0,8

1,2 + 2,3 + 3,4 - 4,5 + 5,6 - 6,7 + 7,8 - 8,9 + 9,1 = 9,3

bạn phúc làm sai rồi phải bằng 5,5 cơ

chia hết

vì 10 chia 3 dư 1 nên \(10^{2018}\)chia 3 dư 1 =>\(10^{2018}\)= 3k+1(k thuộc N)

suy ra \(10^{2018}-4\)= 3k+1-4=3k-3=3.(k-1)

vì 3 chia hết cho 3 nên 3.(k-1) chia hết cho 3 

=> \(10^{2018}-4\)chia hết cho 3

Cũng không quá khó nhỉ xét chữ số thôi hà(mà bạn học tới số nguyên chưa nhờ nếu chưa thì xem cách sau)

Vì 10²⁰¹⁸ có tổng chữ số là 1, -4 là -4 nên C có tổng chữ số là -3 nên chia hết cho 3 

P/s:cách trên nguy hiểm phết không biết có sai hay ngộ nhận gì không