chiều rộng là:60x1/2=30m

dt là:60x30=180m

Có tất cả là 13 hình tam giác nha bạn!

         GOOD LUCK!

Cách giải tớ mới tin

\(\frac{a}{b}=\frac{a+n}{b+n}\)  hoặc có thể là : \(\frac{a}{b}< \frac{a+n}{b+n}\)

I. Complete these sentences with the missing words

1. Farmers are burning....... the forests.

2. They need more..... fields

3.The wind.......animals are in danger

4.We are waste......too much power

5. Chickens produce......a lot of eggs

6.Don't throw......trash in the streets

7.We should save......water

8.Don't pick.....wild flowers

II. Rewrite te sentences

1.does/world/the/why/more/need/food?

=> why does the world need more food ?

2. We/much/too/are/coal/and/burning/gas/oil

=> we are burning too much oil, gas and coal

3.off/grass/the/keep

=> keep off the grass

4.recycle/in/we/waste/paper/Viet Nam/do/?

=> do we recycle waste paper in Viet Nam?

5.should/leave/trash/our/we/in/trash/can/a

=> we should leave our trash in a can

6.is/polluting/land/the/rivers/the/oceans/and/what/?

=> what is polluting the land, the rivers and oceans?

I. Make question for the underlined word

1. My cousin is from Australia

=> where is your cousin from?

2. My math teacher can speak English

=> which language can your math teacher speak?

3. Miss Halery is American

=> what is Miss Halery's nationality?

4. Ha Noi is. Ha Noi is smaller than Ho CChi Minh City

=> which city is smaller, Ha Noi or Ho Chi Minh city?

5. Tokyo has a population of 12 millon

=> how many is the population of tokyo

6.Asia is the biggest continent

=> what is the biggest continent?

7.The Nile River is 6,437 km long

=> how long is the Nile River?

8.Yes. Ha Noi hhas many lakes

=> Does Ha Noi have any lakes?

II.Use the correct form of the the adjectives in italics.

1. Paul's apartment is ....neater than.... mine. NEAT

2. This suitcase is ...heavier than... that one. HEAVY

3. The Caribean Sea is .....larger than... the Mediterranean Sea. LARGE

4. Africa is ....bigger than.. North America. BIG

5. Australia is ..the smallest.... continent in the world. SMALL

6. In my opinion. Seattle is...the largest...city in the United States ( mk đoán vậy thôi =))