Vòi thứ 2 chảy được là

`2/5-1/7=9/35` ( phần bể)

Cả 2 vòi chảy được só phần bể là

`2/5+9/35=23/25` (phần bể)

Tham khảo:

`7 xx 2  = 14`

`(84 + 14 ) : 2 = 49`

Số thứ hai là :

`84 – 49 = 35`

The water _____________. Can you turn it off?

(1 Point)

boils

has been boiling

is boiling

will boil

18

My train _____________ at 11:30, so I need to be at the station by 11:15.

(1 Point)

will leave

leaves

is leaving

is going to leave

19

I _____________ tomorrow, so we can go out somewhere.

(1 Point)

will not work

am not working

don't work

am not going to work

20

Khoa _____________ his English skills a lot recently.

(1 Point)

improved

was improving

has improved

improves

`2/3`

`1.` A. facsimile  B. transfer  C. spacious  D. fax 

`2.` A. subsciribe  B. facsimile  C. pride D. provide 

`3.` A. exactly  B. exist  C. exhaust  D. extinct 

`4.` A. fuel  B. use  C. full  D. nuclear 

D

Nửa chu vi là :

`9/10 : 2 = 9/10 (m)`
Chiều dài là :

`( 9/10 + 1/20 ) : 2 = 19/40 (m)`
Chiều rộng là :

`9/10 - 19/40 = 17/40 (m)`
Diện tích là :

`19/40 xx 17/40 = 323/1600 (m<sup>2</sup>)`

D

` x : 0,125 + x : 0,5 = 9,34`

 `X xx  8+X xx2= 9,34`

 `X xx (8+2)=9,34`

 `X xx10=9,34`

`X=9,34:10`

`X= 0,934`