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24 tháng 10 2021

Ta lần lượt gọi các cạnh của hình tam giác là a, b, c. 

Áp dụng tính chất của dãy tỉ số bằng nhau ta có:

 \({a\over 2}= {b\over 3} = {c\over 4}\) = \({a + b + c\over 2+3+4}\) = \({54\over 9}\) = 6

Với \({a\over 2}\) = 6 thì a = 6 . 2 = 12 

Với \({b\over 3}\) = 6 thì b = 6 . 3 = 18

Với \({c\over 4}\) = 6 thì c = 6 . 4 = 24

Vậy ta có a = 12; b = 18; c = 24.

Nên độ dài các cạnh hình tam giác là 12cm, 18cm và 24cm.

24 tháng 10 2021

câu  b nha

27 tháng 10 2021

(27) comfortable

(28) house

(29) walks

(30) classmates

(31) end

Chúc bạn học tốt

B. Vô cùng nhân từ, hết mực yêu thương

@Bảo

#Cafe

xin giúp mình với :Choose the sentence (A, B, C or D) that is closest in meaning to the sentence.50. My favorite room in the house is the kitchen.A. I like eating, so I like kitchen.B. When I come into the kitchen, I like it.C. I like the kitchen in the house.D. Kitchen is the place for us to ear every day.51. The garden is in front of the building.A. The building is between the garden and the house.B. The building is next to the garden.C. The building is behind the garden.C. The building...
Đọc tiếp

xin giúp mình với :

Choose the sentence (A, B, C or D) that is closest in meaning to the sentence.

50. My favorite room in the house is the kitchen.

A. I like eating, so I like kitchen.

B. When I come into the kitchen, I like it.

C. I like the kitchen in the house.

D. Kitchen is the place for us to ear every day.

51. The garden is in front of the building.

A. The building is between the garden and the house.

B. The building is next to the garden.

C. The building is behind the garden.

C. The building is under the garden.

52. Mr. Tu rides to school with me.

A. Mr. Tu goes to school with me on foot.

B. Mr. Tu walks to school with me.

C. Mr. Tu goes to school with me by bike.

D. Mr. Tu goes to school with me by bus.

53. Lan’s eyes are big and black.

A. Lan has big black eyes.

B. Lan has black big eyes.

C. Lan has a big black eye.

D. Lan has a black big eye.

54. My teacher’s hair is straight and black.

A. My teacher has straight and black.

B. My teacher has black straight hair.

C. My teacher has a straight black hair.         

D. My teacher has a black straight hair.

55. There are many pictures below the clock in my dining room.

A. The clock is in front of many pictures in my dining room.

B. My dining room has a clock among many pictures.

C. The clock is above a lot of pictures in my dining room.

D. We have a dining room with many pictures in the middle of the clock.

56. His favourite subjects at school is Mathematics.

A. He likes many subject at school, especially Mathematics.

B. Mathematics is the subject he likes.

C. He is very good at Mathematics.

D. He likes his Maths class a lot.

2
24 tháng 10 2021

Choose the sentence (A, B, C or D) that is closest in meaning to the sentence.

50. My favorite room in the house is the kitchen.

A. I eating, so I kitchen.

B. When I come into the kitchen, I it.

C. I the kitchen in the house.

D. Kitchen is the place for us to ear every day.

51. The garden is in front of the building.

A. The building is between the garden and the house.

B. The building is next to the garden.

C. The building is behind the garden.

C. The building is under the garden.

52. Mr. Tu rides to school with me.

A. Mr. Tu goes to school with me on foot.

B. Mr. Tu walks to school with me.

C. Mr. Tu goes to school with me by bike.

D. Mr. Tu goes to school with me by bus.

53. Lan’s eyes are big and black.

A. Lan has big black eyes.

B. Lan has black big eyes.

C. Lan has a big black eye.

D. Lan has a black big eye.

54. My teacher’s hair is straight and black.

A. My teacher has straight and black.

B. My teacher has black straight hair.

C. My teacher has a straight black hair.         

D. My teacher has a black straight hair.

55. There are many pictures below the clock in my dining room.

A. The clock is in front of many pictures in my dining room.

B. My dining room has a clock among many pictures.

C. The clock is above a lot of pictures in my dining room.

D. We have a dining room with many pictures in the middle of the clock.

56. His favourite subjects at school is Mathemas.

A. He s many subject at school, especially Mathemas.

B. Mathemas is the subject he s.

C. He is very good at Mathemas.

D. He s his Maths class a lot.

24 tháng 10 2021

50- C. I the kitchen in the house (vì my favourite thg sẽ bằng i )
51- C. The buidling is behind the garden ( behind và ìn front of là 2 từ opposite với nhau)
52- C. Mr Tu goes to school with me by bike (ride đi vói bike,bycicle còn drive đi với car, bus và các transprotation như thế)
53- A. Lan has big black eyes
54- B.My teach has black straight hair( hair là uncountable noun nên sẽ ko đi với "a")
55- C.The clock is above a lot of pictures in my dinning room. (Above trái nghĩa với below)
56- B. Math is the subject he s ( câu này mk chưa chắc vì Math is the subject that he s sẽ hợp lý hơn)