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25⋅69+31⋅25−15025⋅69+31⋅25−150
=25⋅(69+31)−150=25⋅(69+31)−150
=25⋅100−150=25⋅100−150
=2500−150=2500−150
=2350

\(25\cdot69+31\cdot25-150\)
\(=25\cdot\left(69+31\right)-150\)
\(=25\cdot100-150\)
\(=2500-150\)
\(=2350\)

17 tháng 12 2021

= 25 . ( 69 + 31 ) -150

= 25 . 100 - 150

= 2500 - 150 = 2350

16 tháng 2 2017

a) -(-1998)-(-271+2998)

=1998+271-2998

=(1998-2998)+271

=-1000+271

=-729

b) -31.25+31.119-31.(-6)

=31.(-25+119+6)

=31.100

=3100

c)-79.(73-27)-73.(-79+27)

=-79.73+79.27+79.73-27.73

=(-79.73+79.73)+(79.27-73.27)

=27(79-73)

=27.6

=162

14 tháng 1 2018

vui

30 tháng 4 2018

                                                            Giải:

                  a)Số học sinh khá chiếm số phần là:

                       31,25%=5/16(số học sinh cả lớp)

                    Số học sinh TB chiếm số phần là:

                      5/16:5/7=7/16(số học sinh cả lớp)

                   Số học sinh giỏi chiếm số phần là:

                      1-(5/16+7/16)=4/16(số học sinh cả lớp)

                    Vậy số H/S giỏi:12 em

                    Vậy số H/S khá:15 em (Sử dụng cách tính tỉ hiệu ở lớp 5 để tính số H/S bạn nhé!

                    Vậy số H/S  TB :21 em

                    b)Tỉ số phần trăm giữa HSG và số HS cả lớp là:

                        12:48=1/4=25% 

                               Đáp số:  a)Giỏi:12 em

                                                Khá:15 em

                                                Trung bình:21 em

                                              b)25%

                   Nhớ  k mk nha.Mk cảm ơn nhìu!!!

                            ^.^                >,<

1 tháng 12 2017

Áp lực của mỗi chân tủ lên sàn nhà là: \(F=\dfrac{10m}{4}=250\left(N\right)\)

Áp suất của mỗi chân tủ lên sàn nhà là: \(p=\dfrac{F}{S}=\dfrac{250}{0,0004}=625000\left(Pa\right)\)

b, Do tủ nặng như nhau nhưng áp suất tối đa là 31,25N do đó áp suất tối thiểu để tủ không bị hư hại là: \(S=\dfrac{F}{p}=\dfrac{1000}{31,25}=32\left(m^2\right)\)

1 tháng 12 2017

a)Diện tích mỗi chân của chiếc tủ lạnh là: (2.2).1 = 4(cm) = 0,04(m)

Đổi: 100kg = 1000N

Áp suất của mỗi chân tủ tác dụng lên mặt sàn là:

p = \(\dfrac{F}{S}\) = \(\dfrac{1000}{0,04}\) = 25000(Pa).

Còn câu b) tui không hiểu đề bài cho lắm.

18 tháng 3 2017

150+150+150+150+150=750

k mình nha

18 tháng 3 2017

= 750 nha

27 tháng 3 2017

150x5=750

18 tháng 3 2017

=750

kick mình nha

28 tháng 12 2023

150 x 1 + 150 x 2 + 150 x 3 +...+ 150 x 99 + 150 x 100

= 150 x ( 1 + 2 + 3 + ... + 99 + 100 )

= 150 x 5050 = 757500

28 tháng 12 2023

  B = 150 x 1 + 150 x 2 + 150 x 3 + ... + 150 x 99 + 150 x 100

B = 150 x (1 + 2 + 3+... + 99 + 100)

Đặt:  A = 1 + 2 + 3 +...+ 100

Dãy số trên là dãy số cách đều với khoảng cách là:

         2 - 1 = 1

Số số hạng của dãy số trên là:

      (100 - 1) : 1 + 1 =  100 (số hạng)

A = (100 + 1) x 100 : 2 = 5050

B = 150 x 5050

B = 757500 

 

 

 

 

12 tháng 2 2017

1100 tk mk nha thanks mk sẽ tk lại

12 tháng 2 2017

150x4+500

=600+500

=1100

Ai k mình 3 k k lại!

Giúp mình đi!

alo alo món tick xào đang chờ các bn đâyQuestion 2. If we _____ wasting water, there will be a shortage of freshwater in a few decades.A. turn onB. look forC. look afterD. go onQuestion 3. My best friend's birthday is _____ 16th September.A. onB. inC. atD. sinceQuestion 4. Asian people eat rice. Rice _____ in many parts of Asia.A. grownB. is grownC. have grownD. has grownQuestion 5. She didn't pass her exam _____ she studied lazily.A. soB. althoughC. becauseD. butQuestion 6. Children...
Đọc tiếp

alo alo món tick xào đang chờ các bn đây

Question 2. If we _____ wasting water, there will be a shortage of freshwater in a few decades.

A. turn on

B. look for

C. look after

D. go on

Question 3. My best friend's birthday is _____ 16th September.

A. on

B. in

C. at

D. since

Question 4. Asian people eat rice. Rice _____ in many parts of Asia.

A. grown

B. is grown

C. have grown

D. has grown

Question 5. She didn't pass her exam _____ she studied lazily.

A. so

B. although

C. because

D. but

Question 6. Children shouldn't be allowed _____ time ______ computer games.

A. waste - to play

B. wasting - playing

C. to waste - to playing

D. to waste - playing

Question 7. Most people believe that school days are the _____ days of their life.

A. better

B. best

C. more best

D. good

Question 8. We _____ a big party for Debbie's birthday.

A. annoyed

B. arranged

C. arrived

D. appeared

Question 9. I think scientists should not be allowed to perform _____ on animals. It's cruel.

A. experiences

B. duties

C. experiments

D. miracles

Question 10. Jennifer was _____ when she realised that there was a hole in her pants.

A. embarrassed

B. depressed

C. confident

D. pleasant

Question 11. The roots take in nutrients and water from the _____.

A. soil

B. leaves

C. stem

D. flower

Question 12. What is a dinosaur?

A. a kind of animal that lives in nature today

B. a kind of animal that lives only in a zoo today

C. one kind of animal that lived 50 years ago

D. one kind of animal that lived millions of years ago

Question 13. Day and night are caused by _____.

A. Earth's spin

B. the way sunlight hits the Moon

C. the Sun's path around the Earth

D. the shape of the Earth

Question 14. Two friends are talking about their upcoming summer holiday.

Jack: "I'm going to take a five-day trip to Singapore."

Jill: "_____"

A. The same to you.

B. No, of course not.

C. You're welcome.

D. Oh, really? Have a great trip!

Question 15. The classmates are planning to take a field trip.

The monitor: "Why don’t we visit Hue Citadel this weekend?

Jean: "_____. We can learn about Vietnamese history."

A. No, thanks

B. No, let’s do that

C. OK, I don’t like

D. That’s a good idea

Question 16. Jenny: "Congratulations on your winning the first prize at the talent contest!"

Tom: "______"

A. You’re welcome.

B. Not at all.

C. Yes, certainly.

D. That’s very kind of you

5
23 tháng 6 2021

Question 2. If we _____ wasting water, there will be a shortage of freshwater in a few decades.

A. turn on

B. look for

C. look after

D. go on

Question 3. My best friend's birthday is _____ 16th September.

A. on

B. in

C. at

D. since

Question 4. Asian people eat rice. Rice _____ in many parts of Asia.

A. grown

B. is grown

C. have grown

D. has grown

Question 5. She didn't pass her exam _____ she studied lazily.

A. so

B. although

C. because

D. but

Question 6. Children shouldn't be allowed _____ time ______ computer games.

A. waste - to play

B. wasting - playing

C. to waste - to playing

D. to waste - playing

Question 7. Most people believe that school days are the _____ days of their life.

A. better

B. best

C. more best

D. good

Question 8. We _____ a big party for Debbie's birthday.

A. annoyed

B. arranged

C. arrived

D. appeared

Question 9. I think scientists should not be allowed to perform _____ on animals. It's cruel.

A. experiences

B. duties

C. experiments

D. miracles

Question 10. Jennifer was _____ when she realised that there was a hole in her pants.

A. embarrassed

B. depressed

C. confident

D. pleasant

Question 11. The roots take in nutrients and water from the _____.

A. soil

B. leaves

C. stem

D. flower

Question 12. What is a dinosaur?

A. a kind of animal that lives in nature today

B. a kind of animal that lives only in a zoo today

C. one kind of animal that lived 50 years ago

D. one kind of animal that lived millions of years ago

Question 13. Day and night are caused by _____.

A. Earth's spin

B. the way sunlight hits the Moon

C. the Sun's path around the Earth

D. the shape of the Earth

Question 14. Two friends are talking about their upcoming summer holiday.

Jack: "I'm going to take a five-day trip to Singapore."

Jill: "_____"

A. The same to you.

B. No, of course not.

C. You're welcome.

D. Oh, really? Have a great trip!

Question 15. The classmates are planning to take a field trip.

The monitor: "Why don’t we visit Hue Citadel this weekend?

Jean: "_____. We can learn about Vietnamese history."

A. No, thanks

B. No, let’s do that

C. OK, I don’t

D. That’s a good idea

Question 16. Jenny: "Congratulations on your winning the first prize at the talent contest!"

Tom: "______"

A. You’re welcome.

B. Not at all.

C. Yes, certainly.

D. That’s very kind of you

# Học tốt #