1 phút 30 giây = ... phút                                               $\frac{1}{3}$13 giờ = ... phút                                                                                                        35 giây = ... phút                                                        4,25 giờ = ...phút                                                                                                  d)216 phút = ... giờ ... phút                                            2,5 phút = ... giây                                                                                                     320 giây = ... phút ...giây                                          b)2 giờ 15 phút = ... phút                                                                                             35 giờ = ... ngày ... giờ                                               4 giờ 15 phút = ... phút                                                                                              60 giờ = ... ngày ... giờ

a)1/4 thế kỉ =24 năm

3,4 ngày=81,6 giờ

1/3 giờ=20 phút

4,25 giờ=255 phút

2,5 phút =150 giây

b)2 giờ 15'=135'

4 giờ 15'=255 phút

c)2 phút 30 giây=2,5 phút

1 phút 30 giây=1,5 phút

35 giây=7/12 phút

d)216 phút=3 giờ 36'

320 giây=5 phút 20 giây

35 giờ=1 ngày 11 giờ

60 giờ=2 ngày 12 giờ

L. Choose the best answer to complete the sentence.
1. Careless driving also accounts_________the the increasing number of traffic accidents.
c. with b. on d. for a. into
2. It was nice___________you to come and see me.
c. of d. to a. for b. with
3. Don't_________television. The baby is sleeping.
a. turn on b. turn off c. look at d. look into
4. The traffic lights were on red___________she didn't stop
a. so b. and c. but d. or
5. He suggests __________at least eight glasses of water a day
a. us to drink b. we should drink c. we will drink d. we drinking
6. At the party I met some people __________names I don't remember.
b. those c. who's a. whose d. their
7. Many tourists enjoy festivals in Viet Nam__________they do not understand Vietnamese culture very much.
b. though a. because c. since d.if
8. Because plastic bags are very hard to________, they will cause pollution.
b. recycle c. reduce d. dissolve a. produce
9. The school gym has___________gym equipment.
b. some of c. a lot of d. a few a. many
10. "Let's eat out this dinner." " __________”
a. Yes, OK. b. My pleasure. c. Yes, please. d. Certainly

chào bạn

đặt A=6(x+7y)-(6x+11y)

=6x +42y-6x-11y

=31y

do 31y chia hết cho 31

6x+11y chia hết cho 31=>6(x+7y) chia hết cho 31

do (6,31)=1=>x+7y chia hết cho 31

vậy nếu 6x+11y chia hết cho 31 thì x+7y cũng chia hết cho 31

kết quả là 8 giờ đó bạn k cho mình nha .

Tornadoes are a commonly natural force of nature. They typically are narrow, black and funnel shaped. Despite their narrow size, they have the potential to leave behind mass destruction and death. Most destruction, injuries and death are a result of the wind speeds during a tornado. Other cyclones used term to. describe tornadoes are deadly and twisters. Tornadoes are often seen as extension of a cumulonimbus cloud.

12 : 2 x 1 = 6

1, the new was announced"the hero is coming"

=> The new was announced that the hero was coming.

2, she said "I wrote to my sister only last week"

=> She said that she had written to her sister only the week before.

3, the man declared "I shall be doing the exactly the same work next monday as I am doing today"

=> The man declared that he should be doing the exactly the same work the following month as he was doing that day.