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xe đồ chơi điêu khiển

Tìm x, biết:   

8,75 x x + 1,25 x x = 20

Tính tích phân I = ∫ 1 e x ln x d x

A.  I = 1 2

B.  I = e 2 - 2 2

C.  I = e 2 + 1 4

D.  I = e 2 - 1 4

Cho a; b; c là ba số thực dương, khác 1. Mệnh đề nào dưới đây sai?

A.  log b a = log b c . log c a

B.  log a α b = 1 α log a b

C.  log a b a 3 = log a b 3

D.  a log a b = b

Rewrite the following sentences so that the second sentence means nearly exactly the same as the first one.

How long have you learnt French?

-> How long ago___________________________________?

Read the letter, then answer the questions below

  Dear Mai,

I’m very pleased that we’re going to be pen pals. I’ll tell you a little about myself, and you can do the same when you write to me.

I live in an area of London called Maida Vale. It’s quite near the centre, but there are parks nearby where I often take my dog, Mickey, for a walk. I live with my parents and my younger brother, Paul. My father works for the post office and my mother has a part-time job as a nurse.

I go to the local comprehensive school, where I have a lot of friends. I like most subjects, but not all of them! In the evening I sometimes visit friends or stay at home and listen to music, and at the weekends I like going swimming or horse-riding.

At the moment I’m working very hard because I have exams soon, so I’m spending a lot of time in the library.

  I’m looking forward to hearing from you. Write soon!

  Best wishes,

  Mary

Who does she live with? → _______________.

Điền số thích hợp vào ô trống:

3 giờ = ..... phút