mua 1kg gạo tẻ và 1kg gạo nếp hết 45000 đồng.Mua 1kg vạo tẻ cà 0,75kg gạo nếp hết 37 500 đồng. Tính 1kg mỗi loại
mua 1kg gạo tẻ và 1kg gạo nếp hết 45000 đồng.Mua 1kg vạo tẻ cà 0,75kg gạo nếp hết 37 500 đồng. Tính 1kg mỗi loại
1+1x2=?
cần xây 1 bể nước mưa hình hộp chữ nhật có thể tích 8m3.chiều dài gấp 4/3 lần chiều rộng. chi phí bỏ ra là 980.000đ/m2.và để hở 1 khoảng hình vuông có diện tích bằng 2/9 diện tích nắp bể . tính chi phí thấp nhất cần bỏ ra
Cho hình chóp SABC có đáy ABC là tam giác vuông tại C. Cạnh bên SA vuông góc với đáy. a)Chứng minh BC vuông góc với (SAC)? b)Gọi AH là đường cao của tam giác SAC. Chứng minh AH vuông góc với (SBC)?
Tính diện tích phần tô đậm biết diện tích hình tròn là 78,5cm2
Bán kính đường tròn là : \(R.R=78,5:3,14=25\)
Mà \(5\times5=25\)
\(\Rightarrow R=5\left(cm\right)\)
\(\Rightarrow d=R+R=5+5=10\left(cm\right)\)
đường kính hình tròn \(=\) đường chéo hinh vuông
Diện tích hình vuông \(ABCD\) là : \(2\times S_{ABD}=2\times\left(\dfrac{1}{2}\times5\times10\right)=50\left(cm^2\right)\)
Diện tích phần tô đậm là : \(78,5-50=28,5\left(cm^2\right)\)
Một hình hộp chữ nhật có chiều dài 8 cm, chiều rộng 5 cm và diện tích xung quanh 156 cm2. Chiều cao của hình hộp chữ nhật đó là bao nhiêu?
Chiều cao là :
\(S_{xp}=2\times h\times\left(a+b\right)\\ \Rightarrow156=2\times h\times\left(8+5\right)\\ \Rightarrow156=26\times h\\ \Rightarrow h=6\left(cm\right)\)
III. Use the correct form of the word in brackets for each gap. 1. The schoolboys were ___________ to go to the match between their school and the nearby one. (excite) 2. Many workers are ___________ to receive the pay when they start the first job.(disappoint) 3. To tell the truth, I was _________ to read the funny stories written by my classmate.(amuse) 4. All of us got ________ to hear of the accident happening to our close friend, Henry. (shock) 5. Nowadays no one is __________ to do what he wants if it does harm to the community. (freedom) 6. My pet dog is __________ to please, so I can give it anything edible. (case) 7. The _________ in the village are is sad to hear that there will be no rain in the next two weeks. (farm) 8. Green Peace is an ________ keen to protect the environment (organize) 9. The scientist is sure to find something __________ from his experiment.(use) 11. Mike failed his physics final ________ and had to sit it again. (examine) 12. Their teachers used to punish them by _________ them stay behind after school. (make) 13. Everyone agrees that a good ___________ is important. (educate) 14. This book has a very __________ introduction. (interest) 15. We find listening ________ tests rather difficult. (comprehend) 16. Ben went on to be a very __________ student at university. (success) 17. You should pay more __________ in class if you want to make progress. (attend) 18. Before you begin the exam paper, please read the instructions ________ (care) 19. In our country, children start __________ school at 12 years old.(second) 20. Ben missed the test because of his ________last Monday. (absent) 21. You must be __________ when you open that door. (care) 22. We'll live a happier and __________ life if we keep our environment clean.(health) 23. You are talking complete ___________ (sense) 25. Some __________ groups have declared a boycott of tourism on the island. (environment) 26. Air ____________ can cause illness and even death. (pollute) 27. We're very __________ about our holiday. (excite) 28. Jackson canceled the concert to the great _________ (disappoint) 29. Customers made a formal _________ treated (complain) 30. She declined his invitation because of the _________ of his fans (polite) 31. That old man told me an _________ story (amaze) 32. Gasoline fumes ________ the city air (pollution) 33. I think the careless drivers should be fined ________ (heavy) 34. Many people are concerned about the pollution of the _________ (environmental) 35. The seaside has a _________ climate (health)
1. The schoolboys were _____excited______ to go to the match between their school and the nearby one. (excite)
2. Many workers are _____disppointed______ to receive the pay when they start the first job.(disappoint)
3. To tell the truth, I was ___amused______ to read the funny stories written by my classmate.(amuse)
4. All of us got ___shocked_____ to hear of the accident happening to our close friend, Henry. (shock)
5. Nowadays no one is _____free_____ to do what he wants if it does harm to the community. (freedom)
6. My pet dog is _____cased?_____ to please, so I can give it anything edible. (case)
7. The _____farmers____ in the village are is->are sad to hear that there will be no rain in the next two weeks. (farm)
8. Green Peace is an ___organization_____ keen to protect the environment (organize)
9. The scientist is sure to find something _____useful_____ from his experiment.(use)
11. Mike failed his physics final ____exam____ and had to sit it again. (examine)
12. Their teachers used to punish them by ____making_____ them stay behind after school. (make)
13. Everyone agrees that a good _____education______ is important. (educate)
14. This book has a very ____interesting______ introduction. (interest)
15. We find listening ___comprehension_____ tests rather difficult. (comprehend)
16. Ben went on to be a very ____successful______ student at university. (success)
17. You should pay more ____attention______ in class if you want to make progress. (attend)
18. Before you begin the exam paper, please read the instructions ____carefully____ (care)
19. In our country, children start ____secondary______ school at 12 years old.(second)
20. Ben missed the test because of his ___absence_____last Monday. (absent)
21. You must be ___careful_______ when you open that door. (care)
22. We'll live a happier and _____healthier_____ life if we keep our environment clean.(health)
23. You are talking complete _____sensibly______ (sense)
25. Some ____environmental______ groups have declared a boycott of tourism on the island. (environment)
26. Air _____pollution_______ can cause illness and even death. (pollute)
27. We're very _______excited___ about our holiday. (excite)
28. Jackson canceled the concert to the great ______disappointment___ (disappoint)
29. Customers made a formal ____complaint_____ treated (complain)
30. She declined his invitation because of the ____impoliteness_____ of his fans (polite)
31. That old man told me an ____amazing_____ story (amaze)
32. Gasoline fumes ____pollute(tham khảo c32)____ the city air (pollution)
33. I think the careless drivers should be fined ____heavily____ (heavy)
34. Many people are concerned about the pollution of the ____environment_____ (environmental)
35. The seaside has a ____healthy_____ climate (health)
Cho ox và Oy là hai tia đối nhau trên Ox lấy điểm M sao cho om = 2 cm trên Oy lấy điểm N sao cho on = 5 cm Tính độ dài đoạn thẳng mn
Vì `O` nằm giữa `M;N`
`=>OM+ON=MN`
`=>2+5=MN`
`=>MN=7(cm)`
Lời giải:
Từ điều kiện đề bài suy ra $O$ nằm giữa $M$ và $N$
$\Rightarrow MN=MO+NO=2+5=7$ (cm)
Vì Ox và Oy là hai tia đối nhau, điểm O nằm giữa hai điểm M và N nên ta có:
\(OM + ON = MN\)
\(2 + 5 = MN\)
⇒\(MN = 7 (cm)\)
Vậy độ dài đoạn thẳng MN là 7 cm.
Tích sau tận cungv bằng chữ số nào?
9 x 19 x 29 x 39 x.....x 199 x 209
a thấy tích trên có 201 thừa số mà mỗi thừa số có tận cùng là 9
nên tích trên có tận cùng là 9^201
ta có: 9^201=9^(4.50).9
vì 9^(4.50) có tận cùng là 1
nên tích trên có tận cùng là 1.9=9
tích trên có tận cùng là 9
hãy viết các tỉ số sau thành tỉ số của 2 số nguyên:3/1/2 và 5/1/2