write a paragraph about what should we do to reduce traffic jams in your area(50-60 words)
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29 tháng 10 2023
a.Ta có:
ˆAKC=ˆAHB=90o,ˆKAC=ˆBAH���^=���^=90�,���^=���^
→ΔAKC∼ΔAHB(g.g)→Δ���∼Δ���(�.�)
→AKAH=ACAB→����=����
→AKAC=AHAB→����=����
Mà ˆKAH=ˆBAC
29 tháng 10 2023
a) Ta có \(\widehat{CEB}=\widehat{CAB}=90^o\) nên 4 điểm A, B, C, E cùng thuộc đường tròn đường kính BC.
b) Kẻ \(FP\perp BC\) tại P. Ta thấy D là trực tâm tam giác FBC nên \(P\in DF\). Dễ thấy \(\Delta CDP~\Delta CBA\left(g.g\right)\) \(\Rightarrow\dfrac{CD}{CB}=\dfrac{CP}{CA}\) \(\Rightarrow CD.CA=CB.CP\)
CMTT, ta có \(BD.BE=BC.BP\)
Do đó \(CD.CA+BD.BE=CB.CP+BC.BP\) \(=BC\left(CP+BP\right)\) \(=BC^2\). Vậy đẳng thức được chứng minh.
29 tháng 10 2023
a) Tam giác ABM vuông tại A có đường cao AC nên \(BC.BM=BA^2\). CMTT, \(BD.BN=BA^2\) nên \(BC.BM=BD.BN\Leftrightarrow\dfrac{BM}{BD}=\dfrac{BN}{BC}\). Từ đây dễ dàng suy ra \(\Delta BNM~\Delta BCD\left(c.g.c\right)\) (đpcm)
b) Ta có OQ//BN, OP//BM, mà \(MB\perp NB\) nên suy ra \(OP\perp BN\), từ đó O là trực tâm tam giác BPN.\(\Rightarrow ON\perp BP\)
Lại có \(QH\perp BP\) nên QH//ON.
Tam giác AON có Q là trung điểm AN, QH//ON nên H là trung điểm OA \(\Rightarrow AH=\dfrac{OA}{2}=\dfrac{R}{2}\) không đổi.
Today, traffic jams and traffic accidents are very big problems in our country. So what should we do to reduce traffic jams and traffic accidents?
There are many following reasons of traffic jams. First, the roads are very narrow. There are too many cars and motorbikes. Second, people don't obey traffic rules. So, what are the solutions to improve traffic jams? First, they have to widen the roads. Second, ask people to obey traffic rules, such as: stop when the lights red, go when the lights green. There are lots of traffic accidents because of many reasons. First, people drive fast or carelessly. It is very easy to have accidents. Second, people don't obey the traffic rules. Third, they don't wear helmets. So, what is the solutions for this problem? First, they should drive or ride more carefully. Second, people should obey traffic rules and always wear helmets when they drive cars.
In sum, you should wear helmet, drive carefully and obey the traffic rules to reduce traffic jams and traffic accidents.
Gửi bạn nhé
To reduce traffic jams in our area, several measures can be taken. Firstly, improving public transportation infrastructure and encouraging its usage can help reduce the number of private vehicles on the roads. Additionally, implementing carpooling and ridesharing programs can help decrease the overall number of cars on the road. Furthermore, investing in smart traffic management systems and promoting alternative modes of transportation such as cycling and walking can help alleviate congestion. Lastly, implementing strict traffic regulations and enforcing them effectively can also contribute to reducing traffic jams in our area.