1B;2A;3A;4D;5C;6B;7D;8B;9D;10C

Bài 1: Em hãy khoanh tròn chữ cái chỉ một từ khác với các từ còn lại:

1. A. football B. song C. tennis D. badminton

2. A. Vietnamese B. April C. Australian D. American

3. A. picture B. red C. black D. green

4. A. teacher B. nurse C. cooker D. cook

5. A.Vietnam B. Singapore C. American D. England

6. A.nice B. take C. thin D. big

7. A. write B. sing C. read D. friend

8. A. shirt B. letter C. blouse D. dress

9. A. am B. is C. are D. an

10. A. white B. green C. sing D. red

11. A. week B. year C. month D. we

12. A. sometimes B. always C. often D. now

Bài 2: Choose the correct answer

1. Are you a student or a teacher?

a. Yes, I am b. No, I am not c. I’m a student d. Yes, I

2. ……..down, please ! a. Sit b. Open c. Close d. Stand

3. ……..up please ! a. Sit b. Open c. Close d. Stand

4. What is ………favourite colour ? I like red. a. his b. her c. your d. you

5. Whose book is this ? a. It’s me b. It’s her c. It’s him d. It’s mine

6. Choose a word which has different part of pronunciation:

a. do b. mother c. brother d. sometimes

7. What are ……..? They are my books. a. it b. this c. that d. these

8. Can you drink……..? -Yes, I can. a. orange juice b. rice c. chicken d. bread

9. I am …..a picture now. a. writing b. playing c. singing d. drawing

10. Tick the odd one out a. picture b. red c. black d. green

Bài 3: Fill in the blank

1. subject  2. doctor  3. head  4. jeans  5. course

6. sunday  7. end  8. three  9. half  10- climb

Bài 4: Matching

1-d,2-b,3-a,4-j,5-e,6-i,7-f,8-g,9-c,10-h

1-h,2-e,3-a,4-i,5-f,6-j,7-d,8-b,9-c,10-g

Bài 5:Leave me out

1. tired 2. mother 3. red 4. science 5. Vietnamese

6. ugly 7. English 8. member 9. American 10. help

Bài 6:Choose the odd one out

1. A. Monday B. Sunday C. Friday D. May

2.A.hot B. weather C. cold D. warm

3.A.when B. how C. what D. these

4.A.subject B. English C. Science D. Music

5. A. draw B. song C. write D. read

6. A. Singapore B. America C. England D. Chinese

7. A. worker B. music C. teacher D. student

8. A. banana B. milk C. apple D. orange

9. A. April B. Tuesday C. March D. August

10. A. cough B. toothache C. head D. fever

Bài 7:Complete the sentences

1. Hello, my name’s Kate. I am ten ……years….old.

2. ……How.. are you ? I’m fine, thanks.

3.There …is…. one living room and one kitchen in my house.

4………Where….. do you go after school ?
Bài 8:Arrange:

1. English / sing / songs / ?/ you / Can

-______Can you sing English songs?_____________________________

2. name / ?/ her / What / is

. -_____What is her name?____________________________________________________

3. ten / years / am / old / I

-_______I am ten years old__________________________________________________

4. my / pen friend./ new / is / This

-_______This is my new pen friend____________________________________________

5. up / get / 6.30 / I / at

_______I get up at 6.30____________________________________________________

6. is / job ? / What / your

-_______What is your job?__________________________________________________

7.Would / you / orange / juice ?/ like / some

-_Would you like some orange juice?_________________________________________

8. Ha Noi ./ I / am / from

-__I am from Ha Noi_______________________________________________________

9. animals / like ? / does / What / Nam

-______What animals does Nam like?_________________________________________

10. My/ name / Hung / is

- My name is Hung_______________________________________________

Bài9: Choose the odd one out.

1. A. England B. America C. Singaporean D. China

2. A. singer B. dance C. teacher D. doctor

3. A. swim B. ride C. job D. play.

4. A. chicken B. milk C. bread D. orange

5. A. engineer B. house C. school D. classroom.

6. A. student B. worker C. teacher D. cooker

7. A. chicken B. bread C. food D.rice

8. A. math B. learn C. science D. music

9. A. breakfast B. lunch C. dinner D. have

10. A. house B. father C. mother D. brother

Bài 10: Fill in the blanks:

1. find

2. down

3. town

4. Below

5. help

6. blue

7. wife

8. Number

9. kitchen

10.blue

11.beach

12. number

Bài 11:Choose the correct answers

1. My house is ……. a. this b. that c. big d. many
2. Who’s …….?- It’s my friend, Nam.

a. that b. his c. her d. it

3. Can I borrow ………?

a. your marker b. these marker c. the teacher d. the pink

4. May I come in ? ………

a. Thanks b. Bye c. Sure d. Yes, you are

5. He can play football…….. he can’t dance.

a. but b. and c. because d. when

Đặt \(\frac{a}{b}=\frac{c}{d}=k\)

 Suy ra: a = kb

              c = kd

Do đó: \(\frac{a\cdot c}{b\cdot d}=\frac{kb\cdot kd}{b\cdot d}=\frac{k^2\cdot\left(b\cdot d\right)}{b\cdot d}=k^{2\left(1\right)}\)

            \(\frac{a^2-c^2}{b^2-d^2}=\frac{\left(kb\right)^2-\left(kd\right)^2}{b^2-d^2}=\frac{k^2b^2-k^2d^2}{b^2-d^2}=\frac{k^2\left(b^2-d^2\right)}{b^2-d^2}=k^2^{\left(2\right)}\)

Từ (1) và (2)  suy ra \(\frac{a\cdot c}{b\cdot d}=\frac{a^2-c^2}{b^2-d^2}\left(đpcm\right)\)

có \(a:b:c:d=2:3:4:5\)=> \(\frac{a}{2}=\frac{b}{3}=\frac{c}{4}=\frac{d}{5}\)=> \(\frac{3a}{6}=\frac{b}{3}=\frac{2c}{8}=\frac{4d}{20}\)

áp dụng tính chất dãy tỉ số bằng nhau, ta co

\(\frac{3a}{6}=\frac{b}{3}=\frac{2c}{8}=\frac{4d}{20}\) =\(\frac{3a+b-2c+4d}{6+3-8+20}\)= \(\frac{105}{21}=5\)

=> 3a= 6.5 = 30, b= 3.5=15, 2c=8.5 =40, 4d= 20.5=100

=> a=10, b= 15, c= 20, d=25

3a+b-2c+4d=105=> 3a+b+4d=105+2c

\(a:b:c:d=2:3:4:5\Rightarrow\frac{a}{2}=\frac{b}{2}=\frac{c}{4}=\frac{d}{5}\)\(\Leftrightarrow\frac{3a}{6}=\frac{b}{3}=\frac{2c}{8}=\frac{4d}{20}\)

\(Vì3a+b+4d=105+2c\Rightarrow3a+b-2c+4d=105\)

Áp dụng tính chất của dãy tỉ số bằng nhau ta có:

\(\frac{3a}{6}=\frac{b}{3}=\frac{2c}{8}=\frac{4d}{20}=\frac{3a+b-2c+4d}{6+3-8+20}\)\(=\frac{105}{21}=5\)

Khi đó \(\frac{3a}{6}=5\Rightarrow a=10\)

            \(\frac{b}{3}=5\Rightarrow b=15\)

             \(\frac{2c}{8}=5\Rightarrow c=20\)

             \(\frac{4d}{20}=5\Rightarrow d=25\)

Vậy a=10;b=15;c=20;d=25

\(a:b:c:d=2:3:4:5=\frac{a}{2}=\frac{b}{3}=\frac{c}{4}=\frac{d}{5}\)

Áp dụng tính chất của dãy tỉ số bằng nhau:

\(\frac{a}{2}=\frac{b}{3}=\frac{c}{4}=\frac{d}{5}=\frac{3a+b-2c+4d}{3.2+3-2.4+4.5}=\frac{105}{21}=5\)

Vậy a=10,b=15,c=20,d=25.

mk nhé bạn ^...^ ^_^

Bài 1: 
Đặt a/b=c/d=k

=>a=bk; c=dk

a: \(\dfrac{a}{3a+b}=\dfrac{bk}{3bk+b}=\dfrac{k}{3k+1}\)

\(\dfrac{c}{3c+d}=\dfrac{dk}{3dk+d}=\dfrac{k}{3k+1}\)

Do đó: \(\dfrac{a}{3a+b}=\dfrac{c}{3c+d}\)

c: \(\dfrac{2a+3b}{2a-3b}=\dfrac{2\cdot bk+3b}{2\cdot bk-3b}=\dfrac{2k+3}{2k-3}\)

\(\dfrac{2c+3d}{2c-3d}=\dfrac{2dk+3d}{2dk-3d}=\dfrac{2k+3}{2k-3}\)

Do đó: \(\dfrac{2a+3b}{2a-3b}=\dfrac{2c+3d}{2c-3d}\)

bài 1:
\(\frac{0}{2017};\frac{0}{1973};\frac{2017}{1973};\frac{1973}{2017}\)

Bài 1 : 

Ta có : P =  a.{ ( a - 3 ) - [(a+3) - [ ( a + 2 ) - (a - 2 )]}

                = a . { ( a - 3 ) - [ ( a + 3 ) - ( -a - 2 )]}

                = a . ( a - 3 -a - 3 - a + 2 )

               = a . ( - a - 8 ) = -8a -a² 

        : Q = [a +( a + 3 ) ] - [ ( a + 2 ) - ( a - 2 ) ]

              = a + a + 3 - a - 2 - a - 2

             = -1 

Ta thấy -1> -8a - a² => Q > P

Bài 2 : 

Ta có : a - ( b - c ) = ( a - b ) + c = ( a + c ) - b 

<=> a - b + c = a - b + c = a + c - b 

do a = a ; b = b ; c = c => 3 vế bằng nhau (đpcm) 

Bài 3:

a) ( a - b ) + ( c - d ) = ( a + c ) - ( b + d ) 

<=> a - b + c - d      = a + c - b - d 

<=> a - a + c - c      - b + b - d + d  = 0

<=> 0 = 0 => VP = VT ( đpcm) 

b) a - b - ( c- d ) = ( a + d ) - ( b + c ) 

<=> a - b - c + d = a + d - b  -c 

<=> a - a - b + b - c + c + d -d = 0

<=> 0 =0 => VP = VT ( đpcm )

1.Bài giải:
Số c là:         1 - 3 = -2
Số b là:         1 - 2 = -1
Số d là:         1 - 4 = -3
Số a là:         1 - (-3) - (-2) - (-1) = 7

Mik nhìn qua thấy hơi vô lí

.ll........//,,,,,,....ll

1. a. Bạn Nam năng làm bài tập về nhà.

b. Em bé hay khóc.

2.

a. Mẹ đi trước, bé cũng lon ton đi sau.

b. Trời vẫn mưa lớn, nước đang dâng lên.

c. Ngày mai trời sẽ nắng.

d. Bạn Huy làm được.

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