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Modern society is constantly developing, and the appearance of the Internet has opened up a whole new era of access and sharing of information. This brings a tremendous reform and benefits to all humanity. In our lives there are innumerable questions that need to be answered, and the Internet was born as a useful tool to help us solve those questions. Searching for information in the past has cost humanity a lot of time and effort, and not everyone had patience to turn the pages one by one to find the information they needed. However, our lives have changed tremendously since the arrival of the Internet, and the search of general information on the Internet has not consumed us much more than mouse clicks and keyboard typing. This is where most basic and specialist information is gathered from the majority of occupations and fields in our life. There are countless websites that contain useful information for research and study, and Wikipedia is now considered to be the most complete and accurate encyclopedia. Searching the Internet is simple, but we should also be careful in getting that information. Not all knowledge on the Internet is accurate and complete, so we need to compare information from many different sources before actually using any of them for our purposes. The Internet is an infinite ocean of knowledge, and we can learn countless things if we know how to use it properly.

Cho hình thang cân , đáy nhỏ AB , đáy lớn CD . Góc nhọn hợp bởi 2 đường chéo AC và BD bằng 60 độ . Gọi M , N là hình chiếu của B , C lên AC và BD , P là trung điểm của BC . Chứng minh rằng tam giác MNP là tam giác đều.

Cần gấp MN có ai bt lm ko giúp mik với ạ!!!

Tìm GTNN của :

a) A=5/4x^2+xy+y^2-3x+5

b) B=x^2+5y^2+4xy+6y+6x-12

Tìm GTNN của :

 2x^2 + y^2 - 2xy + 4y -5.

Cần gấp mn ơi giúp mik với!!!

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