Ta có : 4 = 2²

6 = 2.3

BCNN(4;6) = 2².3=12

=> BC(4;6) = B(12)={0,12,24,36,45,...}

sau đây mình xin trả lời câu hỏi này

vì 60 chia hết cho 2,3,4,5,6 nên ta chỉ việc cộng thêm 1

60 + 1 = 61

      Đáp số : 61

Would you like to eat?

- Yes , please

- No , thanks

What subjects do you like ?

- I like ...

- My favourite subject is ...

1.my friend/Peter/have/short/fair/hair/.

\(\Rightarrow\) My friend, Peter has short fair hair.

2.what/sister/hair/like/?

\(\Rightarrow\) What does her sister hair like ?

3.it/straight/long/black/hair/.

\(\Rightarrow\) It is straight long black hair.

4.her lips/red/.

\(\Rightarrow\) Her lips are red.

5.my sister/understand/things/quick/and easy/

\(\Rightarrow\) My sister can understand things quick and easy.

a) a drop of water

b) a grain of rice

c) a lump of sugar

d) an item of information

e) a piece of iron

1. (1 + 3 + 5 + ... + 2005) . ( 125125.127 - 127127.125)

Ta có 125125.127 - 127127.125

=125.1001.127 - 127.1001.125

=0

=> (1 + 3 + 5 + ... + 2005) . ( 125125.127 - 127127.125)

= (1 +3 + 5 +...+ 2005) . 0

=0

\(A=\dfrac{5}{11.16}+\dfrac{5}{16.21}+\dfrac{5}{21.26}+...+\dfrac{5}{61.66}\)

\(=\left(\dfrac{1}{11}-\dfrac{1}{16}\right)+\left(\dfrac{1}{16}+\dfrac{1}{21}\right)+...+\left(\dfrac{1}{61}+\dfrac{1}{66}\right)\)

\(=\dfrac{1}{11}-\dfrac{1}{16}+\dfrac{1}{16}-\dfrac{1}{21}+...+\dfrac{1}{61}-\dfrac{1}{66}\)

\(=\dfrac{1}{11}-\dfrac{1}{66}\)

\(=\dfrac{5}{66}\)

Số 4 trong số La Mã là IV

Số 5 trong Tiếng Anh là FIVE

=>Viết số 4 vào giữa số 5 là FIVE

Đặt A = 4 + 12 + 24 + ... + 19404 + 19800

\(\dfrac{1}{2}\) A = 2 + 6 + 12 + ... + 9702 + 9900

\(\dfrac{1}{2}\) A = 1.2 + 2.3 + 3.4 + ... + 98.99 + 99.100

\(\dfrac{3}{2}A\) = 1.2.3 + 2.3.(4-1) + 3.4.(5-2) + ... + 98.99.(100-97) + 99.100.(101-98)

\(\dfrac{3}{2}A\) = 1.2.3 + 2.3.4 - 1.2.3 + 3.4.5 - 2.3.4 + ... + 99.100.101 - 98.99.100

A =(99.100.101).\(\dfrac{2}{3}\)

A = 666600

sao lại tia BA tớ tưởng có Đoạn thẳng AB rồi mà