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Giúp mìn nhé !! Mình cần gấp !! Ai nhanh mìn tick cho !! Cảm ơn nhìu !!
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3
22 tháng 9 2021
\(A=\sqrt{4-\sqrt{15}}\left(4+\sqrt{15}\right)\sqrt{2}\left(\sqrt{5}-\sqrt{3}\right)\\ A=\sqrt{8-2\sqrt{15}}\left(\sqrt{5}-\sqrt{3}\right)\left(4+\sqrt{15}\right)\\ A=\sqrt{\left(\sqrt{5}-\sqrt{3}\right)^2}\left(\sqrt{5}-\sqrt{3}\right)\left(4+\sqrt{15}\right)\\ A=\left(\sqrt{5}-\sqrt{3}\right)^2\left(4+\sqrt{15}\right)\\ A=\left(8-2\sqrt{15}\right)\left(4+\sqrt{15}\right)\\ A=2\left(4-\sqrt{15}\right)\left(4+\sqrt{15}\right)=2\left[4^2-\left(\sqrt{15}\right)^2\right]=2\cdot1=2\)
22 tháng 9 2021
\(A=\sqrt{4-\sqrt{15}}\cdot\left(4+\sqrt{15}\right)\left(\sqrt{10}-\sqrt{6}\right)\)
\(=\left(8-2\sqrt{15}\right)\left(4+\sqrt{15}\right)\)
\(=2>\sqrt{3}\)
17 tháng 9 2021
1.\(sin^2\alpha+cos^2\alpha=\left(\dfrac{AC}{BC}\right)^2+\left(\dfrac{AB}{BC}\right)^2\)
=\(\dfrac{AC^2+AB^2}{BC^2}=\dfrac{BC^2\left(pytago\right)}{BC^2}=1\)
2.ta có \(tan\alpha=\dfrac{AC}{AB}\)
\(\dfrac{sin\alpha}{cos\alpha}=\dfrac{\dfrac{AC}{BC}}{\dfrac{AB}{BC}}=\dfrac{AC}{AB}\)
\(\Rightarrow tan\alpha=\dfrac{sin\alpha}{cos\alpha}\)
3.ta có:\(1+tan^2\alpha=1+\left(\dfrac{sin\alpha}{cos\alpha}\right)^2\)
=\(\dfrac{sin^2\alpha+cos^2\alpha}{cos^2\alpha}\)=\(\dfrac{1}{cos^2\alpha}\)
4.ta có :\(cot\alpha=\dfrac{AB}{AC}\)
\(\dfrac{cos\alpha}{sin\alpha}=\dfrac{\dfrac{AB}{BC}}{\dfrac{AC}{BC}}=\dfrac{AB}{AC}\)
\(\Rightarrow cot\alpha=\dfrac{cos\alpha}{sin\alpha}\)
\(1+cot^2\alpha=1+\left(\dfrac{cos\alpha}{sin\alpha}\right)^2=\dfrac{sin^2\alpha+cos^2\alpha}{sin^2\alpha}\)=\(\dfrac{1}{sin^2a}\)
26 tháng 11 2018
Có tất cả số lẻ là :
( 5677 - 1234 ) : 2 + 1 = 2222 ( chữ số )
Đ/s : 2222 chữ số
DT
0
BK
3 tháng 8 2019
Every day I have chance to watch different famous people shine and bring inspiration to others on TV; however, the one that inspires me the most is BTS . band is a typical example of a strong, intelligent and independent woman. However, band overcame all the difficulties to become one of the most successful singer and composer of America. Band challenges herself in different types of music, from Country, Ballad to Pop, and all of her songs carry deep meanings. Most people can find themselves in her lyrics and band melodies. Besides her singing career, band is also a who has band own enterprises and brand names. band had tried so hard in band youth to achieve the things that I always dream of; therefore, band is a great symbol that I always look up. band is forever my beloved idol, and her effort is the goal for me to never quit trying.
15 tháng 8 2020
=(39/4:26/5+17/5×75/34):(-25/16)
=(39/4×5/26+17/5×75/34):(-25/16)
=(15/8+15/2):(-25/16)
=75/8:(-25/16)
=75/8×(-16/25)
=-6
21 tháng 2 2022
Về thăm nhà Bác
Về thăm nhà Bác, Làng Sen
Có hàng râm bụt thắp lên lửa hồng
Có con bướm trắng lượn vòng
Có hàng ổi chín vàng ong sắc trời
Ngôi nhà thuở bác thiếu thời
Nghiêng nghiêng mái lợp bao đời nắng mưa
Chiếc giường tre quá đơn sơ
Võng gai ru mát những trưa nắng hè
Làng Sen như mọi làng quê
Ngôi nhà lẫn với hàng tre bóng trònVề thăm nhà Bác
Về thăm nhà Bác, Làng Sen
Có hàng râm bụt thắp lên lửa hồng
Có con bướm trắng lượn vòng
Có hàng ổi chín vàng ong sắc trời
Ngôi nhà thuở bác thiếu thời
Nghiêng nghiêng mái lợp bao đời nắng mưa
Chiếc giường tre quá đơn sơ
Võng gai ru mát những trưa nắng hè
Làng Sen như mọi làng quê
Ngôi nhà lẫn với hàng tre bóng tròn
Since I was young, I had always been interested in comics, and Doraemon is my favorite series. Although many people say that this is a series for children, I still maintain the habit of reading the story about that robot cat every time I have free time. Doraemon is a Japanese manga series by Fujiko. F. Fujio, it is about a robot cat named Doraemon from the 22nd century with a miracle bag in front of his belly. He uses his time machine to go back to the past to help a gentle, kind but also very clumsy friend named Nobita. At his house, Doraemon, Nobita and his friends such as Shizuka, Jaian, and Suneo go through many interesting, humorous as well as touching stories. The series is divided into short and long stories. In the short ones, each episode will include many small stories that happen around the daily life of Nobita. Since he is a very clumsy boy who is often bullied by his friends, he needs Doraemon to use the magic gadgets of the future to help him for most of the time. In the long ones, Doraemon, Nobita and his friends will be going on mysterious yet dangerous adventures to save the world. Of course, each adventure is always out of danger and achieves success thanks to the magic gadgets of Doraemon and the sincere friendship of the group. Beside the hope of miracles in the future, author had also featured in many lessons about pure friendship, kindness, sacrifice and solidarity in his series. Doraemon is not only a comic series for children, but it is also a spiritual food, a childhood friend of many adults.
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