Mọi ngừi ơi mau lên nha mik đang cần gấp 

a: =5/6(1/8+2/3)=5/6*19/24=95/144

b: =3/4(7/5-1/2)=27/40

c: =35/24*2/3=35/36

2014 x 16 - 2004 x 2004 + 2004 x 2988

= 2014 x (16-2004+2988) = 2014 x 3000 = 6042000

1006 x 18 + 6 x 6000 - 18 x 1006

= (1006 x 18 - 18 x 1006 ) + 6 x 6000 = 6 x 6000 = 36000

k mk nha

nguyễn anh quân làm đúng rồi tk mình nhé ^-^

chúc bạn học giỏi 

2004x16-2004x2004+2004x2988=2004x(16-1+2988)

                                                    =2004x3003

                                                    =6018012

1006x18+6x6000-18x1006=1006x(18+6-18)

                                           =1006x6

                                           =6036

2 x 125 x 18 + 36 x 252 + 4 x 223 x 9

= (18 x 2) x 125 + 36 x 252 + (4 x 9) x 223

= 36 x 125 + 36 x 252 + 36 x 223

= 36 x (125 + 252 + 223)

= 36 x  600

=  21 600

tham khảo nha bạn

Dear Linh,

I am so glad when I received your letter. I am sorry because I am so busy that I haven’t written to you all this time. Today, I want to tell you about my tiny family. There are four members: my parents, my older sister and me. My father is 45 years old named Hung. He works at the factory. My mom is a teacher and she is 40 years old. Her name is Van and she is a pretty woman. My sister is 3 years older than me named Phuong. My family is always very happy and willing to help together. At the weekend, my family often goes picnic or visit our grandparents in Hai Phong. In my free time, I always help my parents clean the house and wash the clothes. However, I’m preparing for my final – term examination. I hope to pass it easily and I will bring result you noe.

And you? Could you tell me anout your life family? I’m looking forward to hearing from you.

Love,

Huong.

~HOK TỐT~

Dear Quỳnh,

I have received your letter and I feel so glad when knowing that you had passed your examinations with good marks. You want me to tell you about my own family. I got married eight years ago. And now I have two sons, they are very studious, my first son is five years old. His name is Khanh. My second son is 3 years old, his name is khiem. My wife is an accountant, She is 35 years old, her name is Doan. My family lives in a small house in thai nguyen city. At the weekend, my family often goes to visit our parents. Sometimes, we stay at home and clean the house. Now I am preparing for my master entrance examination.it is very hard for me but I try my best, to pass the exam.

I have told you something about my own family life. How about your family life? Are you ready to let me know about it? I am really excited to hear about it.

Best wishes to you,

sorry mình chưa học lớp 6

Trả lời:

a, \(A=1+2^1+2^2+2^3+...+2^{2007}\)

\(\Rightarrow2A=2\left(1+2^1+2^2+2^3+...+2^{2007}\right)\)

\(\Rightarrow2A=2+2^2+2^3+2^4+...+2^{2008}\)

b, Ta có: 

\(2A-A=2+2^2+2^3+2^4+...+2^{2008}-\left(1+2+2^2+2^3+...+2^{2007}\right)\)

\(\Rightarrow A=2+2^2+2^3+2^4+...+2^{2008}-1-2-2^2-2^3-...-2^{2007}\)

\(\Rightarrow A=\left(2-2\right)+\left(2^2-2^2\right)+\left(2^3-2^3\right)+...+\left(2^{2007}-2^{2007}\right)+2^{2008}-1\)

\(\Rightarrow A=2^{2008}-1\) (đpcm)

Cho A= 1 + 2^1 + 2^2 + 2^3 + ....... + 2^2007

a) Tính 2A

suy ra 2A= 2 + 2^2 + 2^3 + 2^4 + ....... + 2^2008

b) Chứng minh A = 2^8 - 1

đang nghĩ b 

đpcm là j vậy bn

16,25 :0,5 + 37,5 + 16,25 :0,125 = 16,25 x2 + 16,25 x8 + 37,5 

                                                     = 16,25 x ( 2 + 8) + 37,5 

                                                     = 16,25 x10 +37,5 

                                                      = 162,5 + 37,5

                                                      = 200

\(\frac{13}{50}+9\%+\frac{41}{100}+\frac{24}{100}\)

\(=\frac{26}{100}+\frac{9}{100}+\frac{41}{100}+\frac{24}{100}\)

\(=\frac{26+9+41+24}{100}=\frac{100}{100}=1\)

= 1 nha

1

yêu ah ko