Unit 3 : At home

Ủa rùi shao =))

câu 4 là C nhé, còn từ dòng dưới là từ câu 5

A - B - D - B - C - B - D - A - B - D - B

1 for

2 with

9)\(\left|\dfrac{3}{4}x-\dfrac{3}{4}\right|\)=\(\left|\dfrac{-3}{4}\right|\)

⇒\(\left|\dfrac{3}{4}x-\dfrac{3}{4}\right|\)=\(\dfrac{3}{4}\)

TH1: \(\dfrac{3}{4}x-\dfrac{3}{4}\)=\(\dfrac{-3}{4}\)⇒\(\dfrac{3}{4}\)x=\(\dfrac{3}{4}\)+\(\dfrac{-3}{4}\)=0

                              ⇒x=0

TH2:\(\dfrac{3}{4}\)x-\(\dfrac{3}{4}\)=\(\dfrac{3}{4}\)⇒\(\dfrac{3}{4}\)x=\(\dfrac{3}{4}\)+\(\dfrac{3}{4}\)=\(\dfrac{3}{2}\)⇒x=\(\dfrac{3}{2}\):\(\dfrac{3}{4}\)=2

`|3/4 x - 3/4| = |(-3)/4|`

`<=> 3/4 . |x - 1| = 3/4 . |-1| `

`<=> |x - 1| = |-1| `

`<=> |x - 1| = 1`

`<=> x - 1 = 1` hoặc `x - 1 = -1`

`<=> x = 2` hoặc `x = 0`

Vậy....

1. don't visit

2. Does Mai go - goes

3. give

4. plays - doesn't like

5. do they go

giải bài trong trang giúp mình ạ,cảm ơn

a) Do `{(AM ⊥z),(KC ⊥z):}`

`=> AM` // `KC  `

b) Do `AM` // `KC `

`=> hat{AMK} = hat{MKC}` (2 góc so le trong)

Mà `hat{AMK} = 30^o`

`=> hat{MKC} =  30^o`

c) Kẻ `Bt ` // `MA ` (`Bt` hướng về bên trái)

Do `Bt` // `MA`

`=> hat{AMB} + hat{MBt} = 180^o` (2 góc trong cùng phía) 

`=> 30^o + 80^o +  hat{MBt} = 180^o`

`=>  hat{MBt} = 70^o`

Do `MA` // `KC => Bt` // `KC `

`hat{CBt} + hat{BCK} = 180^o` (2 góc trong cùng phía) 

`=> hat{CBt} + 160^o = 180^o`

`=> hat{CBt} = 20^o`

Khi đó: `hat{MBC} = hat{MBt} +  hat{CBt} = 70^o + 20^o = 90^o`

`=> BC ⊥ MB (đpcm)`

a: ta có: \(\widehat{xCD}=\widehat{mCA}\)(hai góc đối đỉnh)

mà \(\widehat{mCA}=60^0\)

nên \(\widehat{xCD}=60^0\)

b: Ta có: \(\widehat{BDC}+\widehat{yDC}=180^0\)(hai góc kề bù)

=>\(\widehat{BDC}=180^0-120^0=60^0\)

Ta có: \(\widehat{xCD}=\widehat{CDB}\left(=60^0\right)\)

mà hai góc này là hai góc ở vị trí so le trong

nên Ax//Dy

=>Ax//By

c: ta có: Ax//By

Ax\(\perp\)AB

Do đó: By\(\perp\)AB

Volunteer work can bring us a lot of benefits

He taught English to a group of street children last summer

They often clean up the dirty river to protect the environment

We are collecting books and clothes for the poor children

Volunteers deliver meals every Sunday morning to the elderly and sick people 

tích cho mình nhé

1. This skirt was bought by Hong last week.

2. Her painting is different from mine.

4. I like taking photos and so does my sister.