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18 tháng 7 2015

\(A=\frac{2^5.9^2}{6^4.8}=\frac{2^5.\left(3^2\right)^2}{\left(2.3\right)^4.2^3}=\frac{2^5.3^4}{2^4.3^4.2^3}=\frac{2^5}{2^7}=\frac{1}{2^2}=\frac{1}{4}\)

29 tháng 3 2017

a) 500                  

b) 2303                

c) 537 

d) 35000

27 tháng 1 2016

tổng hai đáy là: 50.4*2=100.8(m)

c.cao hình thang là:64.8/7.2=9(m)

S thửa ruộng là:100.8*9=907.2(m2)

 

 

18 tháng 9 2016

1.

a) (1253x75-1755:5):20012002= 0 : 20012002= 0

b) 16x64 x82:(43x25x16) = 65536 : 576= 1

10 tháng 2 2018

bai1

        So do la:

                 13,5:100*15=2,025

       1/5 so do la

                  2,025:15=0,135

20 tháng 2 2018

lô bà Tú

It took hundreds of thousands of years for the world population to grow to 1 billion. However, in just another two centuries, it grew sevenfold. You know, in 2011, the total population of the world reached 7 billion. And today, it's about 7.5 billion. Tokyo, with 37.8 million residents, continues to be the largest city in the world in terms of population.Advances in modern medicine are the main cause of this dramatic growth in the world population. It helps the birth rates increase and the...
Đọc tiếp

It took hundreds of thousands of years for the world population to grow to 1 billion. However, in just another two centuries, it grew sevenfold. You know, in 2011, the total population of the world reached 7 billion. And today, it's about 7.5 billion. Tokyo, with 37.8 million residents, continues to be the largest city in the world in terms of population.

Advances in modern medicine are the main cause of this dramatic growth in the world population. It helps the birth rates increase and the death rates decline. The second contributor is the improvement in living standards. This leads to the rise of global lifespan, from 64.8 years in the early 1990s to 70.0 years today. Last but not least, the number of women of reproductive age is increasing day by day.

However, the rapid population growth can lead to the shortage in medical and educational facilities and services. The population grows fast so the demand for energy also increases. Therefore, energy shortages are also a big problem. In addition, air, water and land pollution caused by growing population in big cities has bad effects on people's health.

Question 7: What is True about Tokyo?

A. It has the largest population in the world.

B. Its population is 37.8 million.

C. Both A & B are correct.

D. None are correct.

1
5 tháng 7 2017

Đáp án: A

Thông tin: Tokyo, with 37.8 million residents, continues to be the largest city in the world in terms of population.

Dịch nghĩa: Tokyo, với 37,8 triệu dân, tiếp tục là thành phố lớn nhất thế giới về dân số.

It took hundreds of thousands of years for the world population to grow to 1 billion. However, in just another two centuries, it grew sevenfold. You know, in 2011, the total population of the world reached 7 billion. And today, it's about 7.5 billion. Tokyo, with 37.8 million residents, continues to be the largest city in the world in terms of population.Advances in modern medicine are the main cause of this dramatic growth in the world population. It helps the birth rates increase and the...
Đọc tiếp

It took hundreds of thousands of years for the world population to grow to 1 billion. However, in just another two centuries, it grew sevenfold. You know, in 2011, the total population of the world reached 7 billion. And today, it's about 7.5 billion. Tokyo, with 37.8 million residents, continues to be the largest city in the world in terms of population.

Advances in modern medicine are the main cause of this dramatic growth in the world population. It helps the birth rates increase and the death rates decline. The second contributor is the improvement in living standards. This leads to the rise of global lifespan, from 64.8 years in the early 1990s to 70.0 years today. Last but not least, the number of women of reproductive age is increasing day by day.

However, the rapid population growth can lead to the shortage in medical and educational facilities and services. The population grows fast so the demand for energy also increases. Therefore, energy shortages are also a big problem. In addition, air, water and land pollution caused by growing population in big cities has bad effects on people's health.

Question 10: What is the reason for people's health problems?

A. Air, water and land pollution in big cities.

B. Increasing demand for energy.

C. Energy shortages.

D. None are correct.

1
20 tháng 6 2018

Đáp án: A

Thông tin: In addition, air, water and land pollution caused by growing population in big cities has bad effects on people's health.

Dịch nghĩa: Ngoài ra, ô nhiễm không khí, nước và đất do dân số ngày càng tăng ở các thành phố lớn có ảnh hưởng xấu đến sức khỏe của người dân.