= ( 27* 6561+729*45) /( 81*10-91) 

=(177147+32805)/(810-91)

=209952/719

còn lại tự làm

cẢM ƠN

Mik óc chó thật

bạn lấy 216 trang+1 trang=217 trang vì thiếu trang 1 nên ta +1

Đáp số: 217 trang

Hi everybody! I am Hoang, I live with my family. We live in a small house in the village of Ha Nam. My house is small but it is very beautiful. There are 3 floors in the house and it has 3 bed rooms, one kitchen and living room together, others is bed rooms. It is not a fantas house but comfortable. In my bedroom, we has bed, wardrobe, a piano, desk and computer, TV, CD payer…. The living room is small but it is very nice and the kitchen is very convenient. In bed room of my children, there is bed, desk and or wardrobe. In fact, it has very litter of decorating things pictures or painting. I prefer the comfortable than the fabilous. My house also has a small garden with some trees and flowers that my friends and I  plant trees. My house isn’t large but it very beautiful, and I love this house so much. My friends and I had try so much to get it and the most important thing it is the place where all members of my family share the happiness and sadness and hurts together.

my house is in the ThaiThuy. there are six room:three bedroom, a living room, a bathroom, ketchen. i  bedroom because play game in my baedroom

BỐ

 K CHO MK NHA

người quan trọng nhất trong gia đình là mình

k nha

truyện gì thế bạn?

25.8.2.5+1000:5

=(25.8).(2.5)+200

=200.10+200

=2000+200

=2200

25.8.2.5+1000:5

= 25.8.2.5+200

=200.10+200

=2000+200

=2200

k mik nha 

~hok tốt~

Bạn nhóm 5 số liên tiếp 1 lần

\(C=(2+2^2+2^3+2^4+2^5)+...+(2^{96}+2^{97}+2^{98}+2^{99}+2^{100})\)

\(C=2.(1+2+2^2+2^3+2^4)+...+2^{96}.(1+2+2^2+2^3+2^4)\)

\(C=2.31+2^6.31+...+2^{96}.31\)

\(C=31.(2+2^6+...+2^{96}) \vdots 31\Rightarrow ĐPCM\)

25 x 8 x 2 x 5 + 1000 : 5 
= ( 25 x 5 ) x ( 2 x 5 ) + 200
= 200 x 10 x 200
= 400000

\(25.8.2.5+1000:5\)

\(=\left(25.8\right)\left(2.5\right)+200\)

\(=200.10+200\)

\(=200\left(10+1\right)\)

\(=200.11\)

\(=2200\)

học tốt 

3B=3+3²+3³+...+3²⁰¹⁰

-B=1+3+3²+...+3²⁰⁰⁹

2B=3²⁰¹⁰-1

B=(3²⁰¹⁰-1)/2

\(B=1+3+3^2+3^3+...+3^{2009}\)

\(3B=3+3^2+3^3+...+3^{2010}\)

\(3B-B=3^{2010}-1\)

\(2B=3^{2010}-1\)

\(\Rightarrow B=\frac{3^{2010}-1}{2}\)

học tốt