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27 tháng 11 2023

a, 8\(⋮\) \(x\); 12 \(⋮\) \(x\)

⇒ \(x\) \(\in\) ƯC(8; 12)

    8 = 23; 12 = 22.3; ƯCLN(8; 12) = 22 = 4

\(x\) \(\in\) Ư(4) = {-4; - 2; -1; 1; 2; 4}

 

27 tháng 11 2023

b, 120⋮ \(x\); 90 \(⋮\) \(x\) 

⇒ \(x\) \(\in\) ƯC(120; 90)

120 =  23.3.5; 90 = 2.32.5; ƯCLN(120; 90) =  2.3.5 = 30

\(x\) \(\in\)Ư(30) = {-30; -15; -10; -6; - 5; -3; -2; -1; 1; 2; 3; 5;6; 10; 15; 30}

Vì - 5 < \(x\) < 10

Nên \(x\) \(\in\) {-3; -2; -1; 1; 2; 3; 5; 6}

 

 

27 tháng 11 2023

             2 tuần = 14 ngày

Trung bình mỗi ngày bán được số mét vải là:

            501,2 : 14 = 35,8 (m)

                              Đáp số: 35,8 m

27 tháng 11 2023

Giúp tớ với các bạn giỏi ơi

27 tháng 11 2023

Số chia hết cho 5 dư 1 là:

      ( 200 : 5 ) - 1* = 39 ( số)

1* : số cuối 201 chia cho 5 dư 1 nhưng số 201 lớn hơn 200 trong đề bài

Nhớ cho like

27 tháng 11 2023

Bổ sung thêm điều kiện của đề: Số cây trồng được của mỗi nhóm là như nhau

Giải

Gọi x (cây) là số cây trồng được của mỗi nhóm (x ∈ ℕ và 200 < x < 250)

Theo đề bài ta có x ∈ BC(8; 9; 12)

Ta có:

8 = 2³

9 = 3²

72 = 2³.3²

⇒ BCNN(8; 9; 72) = 2³.3² = 72

⇒ x ∈ BC(8; 9; 72) = B(72) = {0; 72; 144; 216; 288; ...}

Mà 200 < x < 250 nên x = 216

Vậy số cây trồng được của mỗi nhóm là 216 cây

27 tháng 11 2023

mình cần gấp

BÀI TẬP NÂNG CAO   Exercise 6 Put the verbs in brackets into the correct form. 1) How …………..….your trip to NhaTrang last week?                                   (be) 2)    They didn’t…………………..…. the trip because of  the snow.             (enjoy) 3) We are going ………………..…. a new house next year.                           (buy) 4) She usually...
Đọc tiếp

BÀI TẬP NÂNG CAO

 

Exercise 6 Put the verbs in brackets into the correct form.

1) How …………..….your trip to NhaTrang last week?                                   (be)

2)    They didn’t…………………..…. the trip because of  the snow.             (enjoy)

3) We are going ………………..…. a new house next year.                           (buy)

4) She usually ………………………. shopping at the weekends.                     (go)

5)    How …..……. she ……….……. To school every day?                               (go)

6)    My parents ……………………. me to the zoo yesterday.                         (take)

7)    My uncle and aunt  ………………..…. Doctors.                                          (be)

8)    I  ……………………. some food yesterday morning.                               (buy)

9)    Did you  ………………... soccer in the school playground last Saturday? (play)

 10) My two brothers and I don’t often  …………………. TV in the evening. (watch)

   Exercise 7 Underline one mistake in each sentence and correct it.

1.     Where did your family went last summer?

ð                                                                   .

2. How did they get on Ha Noi?

ð                                                                     .

3. I made a taxi to the train station yesterday.

ð                                                                   .

4. He lived with his parents in the south to Viet Nam.

ð                                                                   

5. My friend went to her hometown with underground.

ð                                                                   

    Exercise 8 Reorder the words to makesentences.

1. on/where/they/holiday/summer/were/their?

ð                                                                   

2. to/she/Thu Le/HoanKiem/Zoo/last/went/and/week./Lake/.

ð                                                                   

3. good/I/City/time/had/Hue/a/in/Imperial/.

ð                                                                   

4. we/our/back/hometown/coach/went/to/by/.

ð                                                                   

5. went/Hoa/uncle/to/by/see/plane/her/.

ð                                                                   

6. to/Nam/week,/by/countryside/last/went/the/underground/.

ð                                                                 .

7. From/my/I/to the/walked/house/railway station/yesterday/.

ð                                                                 

8. I/there/I/like/can/beautiful/views/by/enjoy/getting/train/because/the/.      

   Exercise 9 Use the words given to make sentences.

1. She/go/to/park/her/parents/yesterday/?

ð                                                                 .....

2. How often/she/go shopping/her mother/?

ð                                                                 

3. How/Nam/go/PhuQuoc Island/last/summer/?

ð                                                                 .

4. They/not/stay/home/last/night/.

ð                                                                 .

5. My parents/not/at/seaside/two days/ago/.

ð                                                                 .

6. You/take/boat trip/your family/last weekend?

ð                                                                 

7. I/like/listen/music/my/free/time.

ð                                                                 .

8. When/i/young/, /i/go/swimming/my friend/.

ð                                                                   

Exercise 10 Read and tick True (T) or False (F).

Tuan and his sister went to Ha Noi last weekend. First, they took a bus from their house to the railway station. Then, they went there by train. They like going by train because they enjoy the beautiful views on the way. They visited many places of interest such as HoanKiem Lake, Temple of Literature, West Lake, Ho Chi Minh  Mausoleum an One Pillar Pagoda. They didn’t have enough time to go to see Bat Trang Pottery Village. They had a wonderful time there. They went back to their hometown  by plane.

5
27 tháng 11 2023

đây là anh đúng k

 

28 tháng 11 2023

Exercise 6 Put the verbs in brackets into the correct form.

1) How ……was……..….your trip to NhaTrang last week?                                   (be)

2)    They didn’t………enjoy…………..…. the trip because of  the snow.             (enjoy)

3) We are going ……………to buy…..…. a new house next year.                           (buy)

4) She usually ………………goes………. shopping at the weekends.                     (go)

5)    How …..…does…. she ……go….……. To school every day?                               (go)

6)    My parents ………………took……. me to the zoo yesterday.                         (take)

7)    My uncle and aunt  ……are…………..…. Doctors.                                          (be)

8)    I  ……………bought………. some food yesterday morning.                               (buy)

9)    Did you  ………play………... soccer in the school playground last Saturday? (play)

 10) My two brothers and I don’t often  ………watch…………. TV in the evening. (watch)

   Exercise 7 Underline one mistake in each sentence and correct it.

1.     Where did your family went last summer?

went => go

2. How did they get on Ha Noi?

ð                                                                     .on => to

3. I made a taxi to the train station yesterday.

ð                                                                   .made => took

4. He lived with his parents in the south to Viet Nam.

ð                                                                   to => of

5. My friend went to her hometown with underground.

ð                                                                   with => by

AH
Akai Haruma
Giáo viên
27 tháng 11 2023

Lời giải:

Vì $ƯCLN(a,b)=16, a>b$ nên đặt $a=16x, b=16y$ với $x,y$ là stn, $x>y$ và $(x,y)=1$

Ta có:

$ab=96$

$\Rightarrow 16x.16y=96$

$\Rightarrow xy=96:16:16=\frac{3}{8}\not\in\mathbb{N}$

Bạn xem lại đề.

AH
Akai Haruma
Giáo viên
27 tháng 11 2023

Lời giải:

$-2(12-5x)^3=-686$

$(12-5x)^3=-686:(-2)=343=7^3$

$\Rightarrow 12-5x=7$

$\Rightarrow 5x=5$

$\Rightarrow x=1$

27 tháng 11 2023

 Cầu vồng thường hay xuất hiện sau mỗi cơn mưa. Sau khi mưa, trên trời vẫn còn nhiều hạt nước li ti, chúng đóng vai trò như lăng kính. Khi ánh nắng mặt trời (là ánh sáng trắng) xuyên qua những "lăng kính" này, nó sẽ bị tán sắc thành dải 7 màu gọi là "cầu vồng" như ta thấy trên bầu trời.

27 tháng 11 2023

a, Chu vi khu đất là:

    0,105 x 4 = 0,42 (km)

b, Diện tích khu đất là:

    0,105 x 0,105 =  0,011025 (km2)

              Đổi 0,011025 =  11,025  ha

Chúc bạn học tốt