6*x+36=64

tìm x

- Giải:

6.x + 36 = 64

6. x = 64 - 36

6.x = 28

x= 28 : 6 

x = 14 / 3

Chọn từ hoặc cụm từ thích hợp để điền vào chỗ trống.

1. _____ class are you in? ~ I'm in class 7B.
    a. Where           b. How many           c. Which           d. What's

2. Nam is a friendly person. He has _____ friends.
    a. some           b. many           c. few           d. much

3. I like swimming and _____ does my sister.
    a. so           b. too           c. neither           d. also

4. What is her _____ name? ~ Pham Thi Hoa.
    a. last           b. family           c. full           d. middle

5. When I'm away from home, I _____ my family very much.
    a. love           b. miss           c. like           d. hate

6. Hoa lives _____ Ha Noi, _____ 12 Tran Hung Dao Street.
    a. in - on            b. in - at           c. at - on           d. on - at

7. _____ is it from here to school? - About two kilometers.
    a. How far           b. How High           c. How long           d. How often

8. I'm very busy these days. ~ _____ .
    a. So I am           b. I do, too           c. Neither am I           d. Me too

a/ ob nằm giữa oa ,oc vì aoc > aob

b/ vì on là pg aoc

=> aon = noc = aoc : 2 = 150 : 2 = 75 độ

c/ vì om là pg aob 

=> aom = mob = aob : 2 = 50 : 2 = 25 độ

vì aon > aom

=> om nằm giữa oa ,on

vì thế: aom + mon = aon

=> mon = aon - aom = 75 - 25 = 50 độ

d/ vì aob < aon

=> ob nằm giữa oa ,on

vì thế: aob + bon = aon

=> bon = aon - aob = 75 - 50 = 25 độ

vì mon > bon

=. ob nằm giữa om ,on

vì thế: mob + bon = mon

=> mob = mon - bon = 50 - 25 = 25 độ

=> mob = bon = 25 độ

từ hai điều in đậm trên, chứng minh ob là pg mon 

- Đẹp quá bạn à :vv

Đốt cháy hết a mol axit X được 2a mol CO₂. Để trung hoà vừa hết a mol X cần 2a mol NaOH. Tìm X

A. C₂H₄(COOH)₂

B. CH₂(COOH)₂

C. CH₃COOH

D. (COOH)₂

 When x is divided by 6 , the remainder is 5 

The remainder when x is devided by 3 is 

Answer: 2

1.Our factory doesn't produce this kind of paper

=> This kind of paper isn't produced ( by our factory )

2.Shakspeare wrote Romeo and Julietin 1952

=> Romeo and Julietin was written by Shakspeare in 1952

3.Did White brothers build the first plane in 1903?

=> Did the first plane was built in 1903 by White Brothers ?

4.They have bulit  a new church near my house.

=> A new church has been built ( by them ) near my house

5.You must do something for these poor men.

=> These poor man must be done something by you

6.Santa Clause gave children presents on Christmas Eve.

=> Children were given presents on Chrismas Eve by Santa Clause

7.Someone has taken my briefcause.

=> My brifecause has been taken 

8.Is she writting a poem?

- Is a poem written by her ?

9.When she came,Mr.Bao was doing an experiment

=> When she came, An experiment was done by Mr.Bao

10.Will you invite her to your wedding party .

=>  Will be her invited to your wedding party by you?

Choose A,B,C, or D for the following sentences :

1. The weather................. nice yesterday

A.is     B.was     C.will be       D.has been 

2. It's difficult...................  your direction

A.to follow               B.following 

C.to following          D.followed 

3. Would you mind................in the front of the Taxi, Mark ? 

A.sit     B.to sit      C.sitting D.siting 

4. I was cooking for dinner..................... 

A.then the phone rang    

B.then the phone was ringing 

C.when the phone rang 

D.when the phone was ringing 

5. On Christmas Eva,  people often ................. a tree 

A.are decorate            B.we're decorated

C.decorating                 D.decorate 

6. I finished housework while my mother................... dinner. 

A.cook.               B.to cook 

C.was cooking            C.is cooking 

7. The first prize......................to the Me Kong team just after the final match yesterday. 

A.award        B.such        C.so       D.so a 

8. It was...................serious accident that he was kept in hospital for a month 

A.such      B.such a      C.so       D.so a