Gọi độ dài chiều cao tam giác là a

Độ dài cạnh đáy tam giác đó sau khi tăng là : 43+7=50(cm)

Ta có S=43xa=559(cm²) => a=559x2:43=26(cm)

Vậy khi tăng độ dài cạnh đáy lên 7 cm thì diện tích tam giác là : \(\frac{50x26}{2}=650\left(cm^2\right)\)

My school has about eight hundred students

viết lại câu sao cho nghĩa ko đổi

1.What about going out tonight? > Why don't we go out tonight?

2.Is this the cheapest hat? >Do it the cheapest hat?

Tim lỗi sai

1.There are some orange juice and some milk to drink

-> is

2.How many homework does nam have everyday?

-> much

3.There are thirteen minutes in an hour

-> of

4.We live at a houseon Le Loi street

-> in

5.Is your name Lan? No,I am not

-> It's

6.My mother is going the market with me

-> going to the

7. Don't to talk in class

-> talk

8.I usually am at home in the evening

-> at

9.Vietnam has lot of beautiful beaches

-> lots

10. How often does she goes to the countryside?

-> go

11.It often take him half hour to get to school

-> getting

12.Tom never has lunch in the canteen

-> at

13. There isn't book on the table

-> any book

14.There are a lot of trees after my aunt's house

15.Apples.lemons and oranges are vegetables

-> fruits

16.What do you do tonight.I'm going out

-> are you doing

17.Does Mr Thanh going to see ha Long tomorrow

-> Are

18.Let's going out for a walk

-> go

19.his homework is the baddest in my class

-> worst

20.She is watching TV everyday

-> watches

21. There is much rain in the dry season

-> many

22.Mr Pike sees game show on TV everyday

-> shows

30=5.6

ta có: S=( 5+5²)+...+5¹⁰

S= 5(1+5)+...+5⁹(1+5)

S= 5.6+...+5⁹.6

S= 6(5+...+5⁹) chia hết cho 6

ta thấy S luôn chia hết cho 5

S chia hết cho 6 và 5 => S chia hết cho 30

vậy S chia hết cho 30

Choose the correct answer.

......................those flowers.

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

An architect planning a new house should always _____ in mind his client’s needs.

A. carry

B. bear

C. remember

D. take

68- 4x = 2x + 2¹⁹ : 2¹⁶

69 - 4x = 2x + 2³

^​​69 - 4x = 2x + 8

​69- 4x - 2x = 8

69 - 2x = 8

​2x = 69- 8

2x = 61

x = 61 : 2

x = ...