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26 tháng 3 2022

7028 - 5 x M = 4733

5 x M = 7028 - 4733

5 x M = 2295

M = 2295 : 5

M = 459

26 tháng 3 2022

là bằng 450 nha.cho xin 1 t.i.c.k đề lấy điểm GP đi.

26 tháng 12 2016

Tỉ lê phần trăm rừng sản xuất so với rừng nước ta :

4 733 : 11 573 x 100% = 40,90 %

3 tháng 10 2016

so sánh

a ) 70028 cm2  ( 7 mét vuông.... )          >                      7028 cm2

    8001 dm2    ( 8001 đề - xi .... )             <                     (    8 mét ..... ) 8100 dm2

    240 dam2     ( 2 ha 40 đề - ca ...  )      >                       ( 204 đề - ca ...... ) 204 dam2

nhé !

\(7m^228cm^2=7028cm^2\)

\(8001dm^2>8m^210dm^2\)

\(2ha40dam^2>204dam^2\)

5 tháng 5 2021

Là những lời niệm ân đức của các BỒ TÁT

ngàn dấu hỏi chám

Bài đọcA Killer Whale? Killer whales, also known as orcas, have a name that may make them sound especially dangerous. But with brains four times larger than human brains, killer whales are actually among the smartest creatures in the world.The name “killer whale” is misleading. Before scientists began studying killer whales, they were known as dangerous, bloodthirsty monsters. But there is actually no record of any serious attacks by wild killer whales on humans at any point in...
Đọc tiếp

Bài đọc

A Killer Whale?

 

Killer whales, also known as orcas, have a name that may make them sound especially dangerous. But with brains four times larger than human brains, killer whales are actually among the smartest creatures in the world.

The name “killer whale” is misleading. Before scientists began studying killer whales, they were known as dangerous, bloodthirsty monsters. But there is actually no record of any serious attacks by wild killer whales on humans at any point in history.

“Killer whale” is also misleading because the creatures are actually part of the family Delphinidae, meaning they are more like dolphins and porpoises than whales. Like common bottlenose dolphins, killer whales are intelligent and easy to teach, which is why you may see them doing tricks at aquariums or amusement parks.

By putting killer whales in captivity, scientists have learned a lot about them, and many people have been entertained by killer whale shows. But killer whales are at their healthiest and smartest when they remain free in the open ocean, where they travel up to 100 miles a day with their families, communicating with and teaching each other.

1. According to the passage, what is another name for killer whales?

  1. porpoises

  2. dolphins

  3. bottlenoses

  4. orcas

2. What is the name of the family that killer whales belong to?

  1. Delphiniden

  2. Dolphinidea

  3. Delphinidae

  4. Dolphinidae

3. As used in paragraph 3, the word intelligent most nearly means

  1. strange

  2. difficult

  3. smart

  4. dangerous

4. In the final paragraph, the passage says, “But killer whales are at their healthiest and smartest when they remain free in the open ocean, where they travel up to 100 miles a day with their families, communicating with and teaching each other.” From this we can understand that

  1. putting killer whales in captivity is not the best option for the creatures

  2. putting killer whales in captivity is not a problem for the creatures

  3. killer whales can learn more on their own in captivity

  4. killer whale tanks in aquariums provide as much freedom as the open ocean

5. Up to how many miles a day do wild killer whales swim with their families?

  1. 500

  2. 100

  3. 10

  4. 1000

6. This passage mostly provides

  1. facts about killer whales and their intelligence

  2. facts about how killer whales are often kept in captivity

  3. information on killer whales’ hunting habits

  4. information on how to capture and train killer whales




 

Bài đọc

A Killer Whale?

 

Killer whales, also known as orcas, have a name that may make them sound especially dangerous. But with brains four times larger than human brains, killer whales are actually among the smartest creatures in the world.

The name “killer whale” is misleading. Before scientists began studying killer whales, they were known as dangerous, bloodthirsty monsters. But there is actually no record of any serious attacks by wild killer whales on humans at any point in history.

“Killer whale” is also misleading because the creatures are actually part of the family Delphinidae, meaning they are more like dolphins and porpoises than whales. Like common bottlenose dolphins, killer whales are intelligent and easy to teach, which is why you may see them doing tricks at aquariums or amusement parks.

By putting killer whales in captivity, scientists have learned a lot about them, and many people have been entertained by killer whale shows. But killer whales are at their healthiest and smartest when they remain free in the open ocean, where they travel up to 100 miles a day with their families, communicating with and teaching each other.

1. According to the passage, what is another name for killer whales?

  1. porpoises

  2. dolphins

  3. bottlenoses

  4. orcas

2. What is the name of the family that killer whales belong to?

  1. Delphiniden

  2. Dolphinidea

  3. Delphinidae

  4. Dolphinidae

3. As used in paragraph 3, the word intelligent most nearly means

  1. strange

  2. difficult

  3. smart

  4. dangerous

4. In the final paragraph, the passage says, “But killer whales are at their healthiest and smartest when they remain free in the open ocean, where they travel up to 100 miles a day with their families, communicating with and teaching each other.” From this we can understand that

  1. putting killer whales in captivity is not the best option for the creatures

  2. putting killer whales in captivity is not a problem for the creatures

  3. killer whales can learn more on their own in captivity

  4. killer whale tanks in aquariums provide as much freedom as the open ocean

5. Up to how many miles a day do wild killer whales swim with their families?

  1. 500

  2. 100

  3. 10

  4. 1000

6. This passage mostly provides

  1. facts about killer whales and their intelligence

  2. facts about how killer whales are often kept in captivity

  3. information on killer whales’ hunting habits

  4. information on how to capture and train killer whales






 

1
27 tháng 8 2021

A killer whale

1. orcas

2. Delphinidae

3. smart

4. putting killer whales in captivity is not the best option for the creatures

5. 100

6. facts about killer whales and their intelligence

CHÚC BẠN HỌC TỐT!!

13 tháng 3 2021

b, pt \(\Leftrightarrow\)mx - 2=0 

Nếu m=0 pt\(\Leftrightarrow\) -2=0 (vô lí)\(\Rightarrow\)m=2(loại)

Nếu m\(\ne\)0 pt có nghiệm x=\(\dfrac{2}{m}\)

 

 

 

 

13 tháng 3 2021

undefinedBạn tham khảo nhé

 

1) A

2) C

3)A

4)C

24 tháng 5 2021

1. a

2. c

3. a

4.c

27 tháng 2 2021

Thay `m=-3` ta có:

`(x+3)/(x+5)+(x-5)/(x-3)=2`

`<=>(x^2-9+x^2-25)/((x+5)(x-3))=2`

`<=>(2x^2-34)/(x^2+2x-15)=2`

`<=>2x^2-34=2x^2+4x-30`

`<=>4x=-4`

`<=>x=-1`

Vậy `S={-1}`

31 tháng 10 2020

Ta có: \(x^3-5x^2+x-5=\left(x-5\right)\cdot M\)

\(\Leftrightarrow M=\frac{x^3-5x^2+x-5}{x-5}=\frac{x^2\left(x-5\right)+\left(x-5\right)}{x-5}=\frac{\left(x-5\right)\left(x^2+1\right)}{x-5}=x^2+1\)

Vậy: \(M=x^2+1\)

a: \(P\left(x\right)=x^5+2x^4-9x^3-x\)

\(Q\left(x\right)=5x^4+9x^3+4x^2-14\)

c:: \(M\left(x\right)=P\left(x\right)+Q\left(x\right)=x^5+7x^4+4x^2-x-14\)

d: \(M\left(2\right)=32+7\cdot16+4\cdot4-2-14=144\)

\(M\left(-2\right)=-32+7\cdot16+4\cdot4+2-14=84\)