went / prepared / took / played / watched / danced / rained

1/ went
2/ prepared
3/ took
4/ played
5/ watched
6/ danced
7/ rained

B

B.
 \(=\left(3^4\right)^3:3^5=3^{12}:3^5=3^7\)

cÂu B 

D

B

d

Bài 4: 

a) \(x+xy-3y=4\)

\(\Leftrightarrow x-3+y\left(x-3\right)=1\)

\(\Leftrightarrow\left(x+y\right)\left(x-3\right)=1\)

mà \(x.y\)là số nguyên nên ta có bảng giá trị: 

b) \(BCNN\left(6,7\right)=42\)nên \(BC\left(6,7\right)=B\left(42\right)\).

\(200< 6k< 2000\Rightarrow33< k< 334\)

suy ra có \(334-33-1=300\)giá trị của \(x\)là bội của \(6\)mà \(200< x< 2000\).

\(200< 7l< 2000\Rightarrow28< l< 286\)

suy ra có \(286-28-1=257\)giá trị của \(x\)là bội của \(7\)mà \(200< x< 2000\).

\(200< 42m< 2000\Leftrightarrow4< m< 48\)

suy ra có \(48-4-1=43\)giá trị của \(x\)là bội của \(42\)mà \(200< x< 2000\)

Số giá trị của \(x\)thỏa mãn ycbt là: \(300+257-43=514\)(số) 

B

b

C

you didn't watch a film

Did you watch a film?

What did you watch?

You watched a film

You didn't watch a film

Did you watch a film?

What did you watch?

b) Did they lock the door?
c) Did she open her present?
d) Did he carry the boxes?

e) Did you call your best friend?
f) Did she play volleyball?
g) Did your brother study History?
h) Did you wait for the bus?
i) DId he listen to music last night?
j) Did they help their mother? 

did they lock the door

Did she open the present

Did he carrie the boxes

Did you call your bestfriend

b. Did they lock the door?

c. Did she open her present?

d. Did he carry the box?

e. Did you call your best friend?

f. Did she play volleyball?

g. Did my brother study history?

h. Did we waited for the bus?

i. Did he listen to music last night?

j. Did they help thier mother?

D

D

D