1) have / her/ she/ What time / does/ science/.

=> What time does she have her sciene class.

2) Jane / Anna / are / now / What / doing / and/?

=> What are Jane and Anna doing now.

1) What time does she have her sciene class.                                          2) What are Jane and Anna doing now?

3' là gì bạn

`430 + 35,2 = (x-9) . 25`

`=> 430 + 35,2 = (x-9) . 25`

`=> 465,2 = (x-9) . 25`

`=> x - 9 =  465,2  : 25`

`=> x - 9 = 2326/125`

`=> x = 2326/125 + 9`

Do `9 ∈ N, 2326/125 ∉ N`

`=> 2326/125 + 9 ∉ N`

Hay `x ∉ N`

Vậy không tồn tại số tự nhiên `x` thỏa mãn ycbt

`x-18-(6320:1580,25) = 300`

`=> x-18-(6320:1580,25) = 300`

`=> x - 25280/6321 = 300 + 18`

`=> x - 25280/6321 = 318`

`=> x = 25280/6321 + 318`

Do `25280/6321 ∉ N, 318 ∈ N`

`=> 25280/6321 + 318 ∉ N`

Hay `x ∉ N`

Vậy không tồn tại số tự nhiên `x` thỏa mãn `ycbt`

(3x+1).9-74=16

(3x+1).9=16+74

(3x+1).9=90

(3x+1)=90/9

3x+1=10

3x=9

x=3

1 He isn't eating ice cream at the moment

2 Are their friends playing games right now?

3 Where are you going now?

4 When is she singing this song?

5 I am not practicing dance at the present

6 You are buying something at the supermarket now

7 Linh's parents are preparing the breakfast for her now

8 What are the cats eating right now?

9 Look! Who is driving the red car at the moment?

1 . he / not eat / ice cream / at the moment  .

He is not eating ice cream at the moment

2 . their friends /play / games / right now / ?

Are you friends playing games right now?

3 . where / you / go / now / ?

Where are you going now?

4 . when / she / sing / this song / ?

When did she sing this song?

5 . i / not practice / dance / at the present

I am not practicing dancing at present

1 is

2 works

3 study

4 isn't

5 don't drink

6 has

7 have

8 Does Hoa like cooking? 

=> Yes, she does

9 Is it 10:15 now?

=> No, it isn't

10 doesn't watch

1\(\)is

2works

3study

4is not(isn't)

5don't drink

6has

7have

8Does/like-Yes,she doesn't

9Is -No, it isn't

10doesn't watch

Chiều cao miếng bìa là:

(56+8):2=32(cm)

Độ dài đáy miếng bìa là:

32-8=24(cm)

Diện tích miếng bìa là:

(32x24):2=384(cm²)

đáp số: 384 cm²

Chiều cao miếng bìa là :

( 56 + 8 ) : 2 = 32 ( cm )

Độ dài đáy miếng bìa là :

32 - 8 = 24 ( cm )

Diện tích miếng bài là :

( 32 x 24 ) : 2 = 384 ( cm² )

Đáp số : 384 cm²

@ChiDung

\(\overline{abcdef}=100x\overline{abcd}+ef=98x\overline{abcd}+2x\overline{abcd}+\overline{ef}⋮7\)

\(98x\overline{abcd}⋮7\Rightarrow2x\overline{abcd}+\overline{ef}⋮7\)

\(\overline{efabcd}=10000x\overline{ef}+\overline{abcd}=9996x\overline{ef}+4x\overline{ef}+\overline{abcd}\)

Ta có

\(2x\left(4x\overline{ef}+\overline{abcd}\right)=8x\overline{ef}+2x\overline{abcd}=7x\overline{ef}+\left(2x\overline{abcd}+\overline{ef}\right)\)

Ta thấy

\(7x\overline{ef}⋮7\)

\(2x\overline{abcd}+\overline{ef}⋮7\left(cmt\right)\)

\(\Rightarrow2x\left(4x\overline{ef}+\overline{abcd}\right)⋮7\Rightarrow4x\overline{ef}+\overline{abcd}⋮7\)

Ta thấy

\(9996x\overline{ef}⋮7;4x\overline{ef}+\overline{abcd}⋮7\Rightarrow\overline{efabcd}⋮7\)