12,5km/giờ=5k/6 phút

Giải ra mà bạn hồ chánh nam

(-69)x|-45|-31x|45|

=(-69)x45-31x45

=45x[(-69)-31]

=45x(-100)

=-4500

\(\left(-69\right)\times\left|-45\right|-31\times\left|45\right|\)

\(=\left(-69\right)\times45-31\times45\)

\(=45\left(-69-31\right)\)

\(=45\times100\)

\(=4500\)

Last Saturday our school football team played a match with Laxman Public School. It was played in our school playground. A large number of students of both the schools were present to witness the match. At 2 p.m., the teams entered the field and took their positions. After the toss, the referee blew the whistle and the match began. Our school football team played very well from the beginning. We scored four goals before half-time. After the interval, the teams changed the sides. Laxman Public School had managed to score three goals before the interval. Laxman Public School tried their best to equalise the score. The captain of Laxman Public School got the ball and scored an easy goal. The referee blew the whistle and the game came to an end. The match exciting ended in a draw

              tk cho mk nha!             

After a week of hard study, Sunday, dad take you watch football at the My Dinh Stadium.

Today Vietnam team met the Thai team. Vietnam team dressed in red, while the Thai team wore blue. Team Vietnam was right before kick off. The referee and referee signaled the game starts. Exciting game from the first minute. First Half our team has not scored any goals.

Into the second half, just 10 minutes Cong Vinh pass the Kingdom, he slowly came Thailand defender and scorer scored his first goal for the team in Vietnam. The whole stadium cheers rang loud cheers. The air is very noisy in the field.

The match began. Thailand team scored the 1-1 equalizer. But just a few minutes later, Van Quyen team scored a goal to add more. First half really tough, aggressive. But by the end of the game is no more goals are scored. The referee whistle well finish the match. Vietnam team won 2-1. This real football game exciting. I hope next time to be announced taken to watch a football game again”.

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ê thằng kiako trả lời thì thôi nghen

\(x^{2018}+10=0\)

\(x^{2018}=-10\)

Vì \(x^{2018}\ge0\forall x\)do đó phương trình vô nghiệm

Vậy không có giá trị của x thỏa mãn

Đổi 2 giờ 15 phút = 2,25 giờ 

Quãng đường AB dài 

     16 x 2,25 = 36 ( km )

Từ A đến B hết 

      36 : 45 = 0,8 ( giờ )

Đổi 0,8 giờ = 48 phút

Người đó phải khởi hành lúc 

     5 giờ - 48 phút = 4 giờ 12 phút

  Chúc bạn học tốt!!

Đặt B =   3² + 3³ + 3⁴ +...+ 3²⁰¹⁸

    3B = 3³ +3⁴ + 3⁵ + ... + 3²⁰¹⁸ +3²⁰¹⁹

 Lấy 3B - B = (3³ +3⁴ + 3⁵ + ... + 3²⁰¹⁸ +3²⁰¹⁹) - (3² + 3³ + 3⁴ +...+ 3²⁰¹⁸)

               B = 3²⁰¹⁹ - 3²

Ta có A = 1 + B + 3²⁰²⁰

             = 1 +3²⁰¹⁹ - 3² + 3²⁰²⁰

             = 1 +3²⁰¹⁹ - 9 + 3²⁰²⁰ 

             = 3²⁰¹⁹ - 8 + 3²⁰²⁰

   Ta có 3⁴ⁿ = ....1

=> 3²⁰²⁰ = 3^4.505 = ...1

=>  3²⁰¹⁹ - 8 + 3²⁰²⁰ =  3²⁰¹⁹ - 8 + ...1

                                  = 3²⁰¹⁹ - 7

Ta có 3²⁰¹⁹ = 3²⁰¹⁶ . 3³

Ta có 3²⁰¹⁶ = 3^4.504 = ...1

=> 3²⁰¹⁹ = ...1 . 3³

              = ...1 . ...7

              = ...7

=> 3²⁰¹⁹ - 7 = ...7 - 7

                    = ...0

=> 3² + 3³ + 3⁴ +...+ 3²⁰¹⁸ tận cùng là 0