Bài 1.

Cho 3 điểm A,B,C thẳng hàng.Điểm C ko nằm giữa 2 điểm A và B cho biết AC=3cm; BC=1cm.

Hãy so sánh BA và BC

Vì AB + BC = AC

Mà AC = 3cm

=> AB ( BA ) = AC - BC = 3 - 1 = 2

Trong khi BC = 1cm

=> AB > BC

Bài 2.

a, Giả sử AB= 3 cm ; BC =5cm ; CA= 8cm.CHứng minh A,B,C thẳng hàng.

Vì AB + BC = AC (1)

=> B nằm giữa A và C (2)

Từ (1) và (2) vậy A , B , C thẳng hàng

b,Giả sử AB= 3 cm ; BC =5cm : CA= 4cm.Chứng minh A,B,C khoong thẳng hàng.

Ta có : AB + BC = CA

Nhưng lại có : 3 + 5 > 4

Mà AB + BC > CA => B không nằm giữa A và C

Vậy A , B , C không thẳng hàng

Học lâu chẳng nhớ gì cả

+ n chia hết cho 2

Mà 6 chia hết cho 2

=> n+6 chia hết cho 2

=> (n+3)(n+6) chia hết cho 2

+ n chia 2 dư 1

Mà 3 chia 2 dư 1

=> n+3 chia hết cho 2

=. (n+3)(n+6) chia hết cho 2

KL: (n+3)(n+6) luôn chia hết cho 2 với mọi n thuộc N

# small , tall , thin , short , big

# often , never , always , sometimes , usually

# peas , beans , lettuce , carrot , cabbage ,

# soda , iced tea , water , milk

# shoulder , foot , chest , leg , arm

=> x thuộc B(12)

=> x thuộc B(21)

=> x thuộc B(28) = {0;28;56;84 ; 112 ; 140 ; 168 ; 196 ; 224 ; 252 ; 280 ; 308 ;.....}

x thuộc {168 ; 196 ; 224 ; 252 ; 280}     

Write questions for the underlined words

1 My parents go jogging " every moring" CHÚ Ý "....................." LÀ PHẦN ĐC GẠCH CHÂN ĐỂ ĐẶT CÂU HỎI

2 they sometimes go to "the zoo"

Where do they sometimes go to ?

3 She of ten plays tennis" in the afternoon"

When does she often play tennis ?

4 "The boy" is listening to music

Who is listening to music ?

5 He plays "badminton"

What does he play ?

6 She " is skipping rope"

What is she doing ?

7 We often go to the cinema "with your friends"

Who do you often go to the cinema with ?

8 He listens to music" twice a week"

How often does he listen to music ?

9 They often wear "warm clothes" when they go camping

What do they often wear when they go camping ?

10 Their father travels to work"by train"

How does their father travel to work ?

sắp xếp

1 the/how/go/the/often/children/to/do/movies/?

How often do the children go to the movies ?

2 sometimes/camping/they/go/do?

Do they sometimes go camping ?

3 usually/up/he/gets/six/at/o'clock

He usually gets up at six o'clock

4 at/always/fishing/their parents/go/do/weekend/?

Do their parents always go fishing at weekend ?

5 Ba/to/zoo/the/sometimes/goes

Ba sometimes goes to the zoo

9with/friends/he/goes/usually/his/swimming

He usually goes swimming with his friends

10 students/picnic/have/a/the/sometimess

The student sometimes have a picnic

Chọn đáp án đúng:

1. Peter ............... a write cat and a black dog

A. has B.have C.had D.having

2. What subjects ........... you study at school?

A. does B.do C. is D.are

3. She ............. fish and beef very much.

A. like B.likes C. to like D. liking

4. What time does your father go to work? - He ................. at seven o'clock

A. go B.goes C. to go D. going

5. I do not go to school ................. Saturday and Sunday

A. on B. at C. in D.from

6. Is ................. your school, David? - Yes, it is

A. that B. these C. those D. there

7. There .............. thirty - two students in my class

A. is B. has C. have D. are

1. Chọn từ có cách phát âm khác với những từ còn lại:

1. A. these B. this C.that D.thanks

2.a. map b.bag c. Monday d. have

3.a. Twenty b. early c. pretty d. fly

4.a. Find b. miss c. live d. think

5.a. child b. chair c. chemis d. cheap

Những từ được in đậm là những từ được gạch chân!

2. Tìm từ khác loại:

1.a. Russian b. Holland c. American d. Japanese

2.a. draw b.teacher c. worker d. cook

3.a. house b. room c. home d. kitchen

4.a. and b. in c. but d. so

5.a. warm b. cold c. cool d. weather