29.375

Give the correct form of the words given to complete the sentences.
1.The _______contaminaion_______ of lakes, rivers, oceans or underwater CONTAMINATE
water pollution.
2. The street doesn’t look_______attractive______ because it has a lot of rubbish.ATTRACT
3. The music club made so much noise that the_____residents_____ complained to REDIDE
its owner.
4. Are all types of pollution_____harmful_____ to the health of humans and animals? HARM
5. The______environmentalists_______ are concerned about the oil spills in East Sea. ENVIROMENT
6. Dumping ______industrial_____waste into the lakes and rivers has caused INDUSTRY
Serious water pollution.
7. Many people in this area have cholera because they drink ____untreated_____water. TREAT
8.Examples of primary________pollutants________are exhaust fumes from cars, POLLUTE
soot from smoke and ash from volcanic eruption.
9. If we use water______carefully______ , more people will have fresh water. CARE
10. The polluted water results in the ____death_____of many aquatic animals DIE
And plants.
III. Combine the sentences in each pair into a new sentence that shows a cause/effect relationship. Use the words in brackets.
1.Many rivers and lakes are poisoned. Factories produce waste and pour it into rivers and lakes. (because)
-> Because factories produce waste and pour it into rivers and lakes, many rivers and lakes are poisoned.
2. The environment is polluted. Birds leave their habitats and plants die. (make)
-> The pollution of the environment makes birds leave their habitats and plants die.
3. Plastic bags are a major source of waste. We should not throw plastic bags everywhere. (so).
-> Plastic bags are a major source of waste so we should not throw plastic bags everywhere.
4. The food is contaminated. People’s health is poor. (results in)
-> The contamination of the food results in people's poor health.
5. Factories release fumes. The air breathe gets polluted. (due to)
-> The air breathe gets polluted due to the release of fumes from factories.
IV. Combine each pair of sentences to form a conditional sentence, using “if” Type 2.
1.The factory is located near our village. There is air pollution and noise pollution.
-> If the factory weren't located near our village, there wouldn't be air pollution and noise pollution.
2. The local people have to use water from the polluted river. They don’t have fresh water.
-> If the local people had fresh water, they wouldn't have to use water from the polluted river.
3. Trees and grasses cannot grow here. The soil is badly polluted.
-> If the soil weren't badly polluted, trees and grass could grow here.
4. Mr Quang works in a noisy environment. His hearing becomes worse.
-> If Mr Quang didn't work in a noisy environment, his hearing wouldn't become worse.

Give the correct form of the words given to complete the sentences.
1.The _______contaminaion_______ of lakes, rivers, oceans or underwater CONTAMINATE
water pollution.
2. The street doesn’t look_______attractive______ because it has a lot of rubbish.ATTRACT
3. The music club made so much noise that the_____residents_____ complained to REDIDE
its owner.
4. Are all types of pollution_____harmful_____ to the health of humans and animals? HARM
5. The______environmentalists_______ are concerned about the oil spills in East Sea. ENVIROMENT
6. Dumping ______industrial_____waste into the lakes and rivers has caused INDUSTRY
Serious water pollution.
7. Many people in this area have cholera because they drink ____untreated_____water. TREAT
8.Examples of primary________pollutants________are exhaust fumes from cars, POLLUTE
soot from smoke and ash from volcanic eruption.
9. If we use water______carefully______ , more people will have fresh water. CARE
10. The polluted water results in the ____death_____of many aquatic animals DIE
And plants.
III. Combine the sentences in each pair into a new sentence that shows a cause/effect relationship. Use the words in brackets.
1.Many rivers and lakes are poisoned. Factories produce waste and pour it into rivers and lakes. (because)
-> Because factories produce waste and pour it into rivers and lakes, many rivers and lakes are poisoned.
2. The environment is polluted. Birds leave their habitats and plants die. (make)
-> The pollution of the environment makes birds leave their habitats and plants die.
3. Plastic bags are a major source of waste. We should not throw plastic bags everywhere. (so).
-> Plastic bags are a major source of waste so we should not throw plastic bags everywhere.
4. The food is contaminated. People’s health is poor. (results in)
-> The contamination of the food results in people's poor health.
5. Factories release fumes. The air breathe gets polluted. (due to)
-> The air breathe gets polluted due to the release of fumes from factories.
IV. Combine each pair of sentences to form a conditional sentence, using “if” Type 2.
1.The factory is located near our village. There is air pollution and noise pollution.
-> If the factory weren't located near our village, there wouldn't be air pollution and noise pollution.
2. The local people have to use water from the polluted river. They don’t have fresh water.
-> If the local people had fresh water, they wouldn't have to use water from the polluted river.
3. Trees and grasses cannot grow here. The soil is badly polluted.
-> If the soil weren't badly polluted, trees and grass could grow here.
4. Mr Quang works in a noisy environment. His hearing becomes worse.
-> If Mr Quang didn't work in a noisy environment, his hearing wouldn't become worse.

gấp rưỡi là 2/3 = 8/12

st1 ứng số phần là : 12 : 100 *75 = 9

ta có sơ đồ : 

st1 : 9 phần 

st2 : 8 phần 

st3 : 12 phần 

tổng 3 số là : 522 *3 = 1566

st1 : 1566 : (9+8 +12) *9 = 486 

st2 : 1566 : (9+8+12) *8 = 432

st3 : 1566 - 432 - 486 = 648 

đúng nha nhớ tick đó 

Bài 1 : 2H2 + O2 ---> 2H2O
2CO + O2 ----> 2CO2
gọi a,b là mol H2 và CO
ta có : 2a+28b = 68g
0,5a + 0,5b = 89,6 : 22,4 = 4
=> a= 6 và b = 2 => % nha bạn

Bài 2 : khối lượng CuO = 20.50/100 = 10 g => nCuO = 0,125 mol
=> khối lượng FeO = 50 - 10 = 40g => nFeO =5/9 mol
Pt tự viết nha : ta đc nH2 = nCuO + nFeO = 49/72 mol => V H2 = 15,24 lit (dktc)

Bài 3 : Fe + H2SO4 -----> FeSO4 + H2
=> mol Fe = mol H2 = 5,6 : 22,4 = 0,25 mol
=> b = 0,25.56 = 14 g
Fe2O3 + 3H2 ----> 2Fe + 3H2O
=> mol Fe2O3 = 0,5 mol Fe = 0,125 mol => a =0,125.160 = 20g

Vì x(x+1)=0 suy ra x phải bằng 0 hoặc x+1 bằng 0.

Suy ra x=0 hoặc =-1

Tich mình nhé

Ta goi tap hop cac so nguyen to nho hon 10 goi la tap hop A. Ta có:

Tập hợp A={ 2,3,5,7,}

NHỚ TICK NHA

\(\dfrac{x-1}{59}\) + \(\dfrac{x-2}{58}\)+ \(\dfrac{x-3}{57}\)= \(\dfrac{x-4}{56}\)+\(\dfrac{x-5}{55}\)+\(\dfrac{x-6}{54}\)

<=> \(\dfrac{x-1}{59}\)-1 + \(\dfrac{x-2}{58}\)-1 + \(\dfrac{x-3}{57}\)-1 = \(\dfrac{x-4}{56}\)-1 +\(\dfrac{x-5}{55}\) -1 + \(\dfrac{x-6}{54}\)-1

<=> \(\dfrac{x-60}{59}\)+ \(\dfrac{x-60}{58}\)+ \(\dfrac{x-60}{57}\)= \(\dfrac{x-60}{56}\)+\(\dfrac{x-60}{55}\)+\(\dfrac{x-60}{54}\)

<=> (x-60) (\(\dfrac{1}{59}\)+ \(\dfrac{1}{58}\)+\(\dfrac{1}{57}\)-\(\dfrac{1}{56}\)-\(\dfrac{1}{55}\)-\(\dfrac{1}{54}\)) = 0

<=> x-60 = 0 ( do 1/59 + 1/58 +1/57 -1/56-1/55-1/54 khác 0)

<=> x=60

21 - 9x = -32x+420

<=> -9x +32x = 420 -21

<=> 23x =399

<=> x = 399/23

Vậy phương trình có nghiệm là x=399/23