Giúp mình vs ạ mình cảm ơn ạ( giải đầy đủ cách trình bày giúo em vs ạ em cảm ơn trc ạ)

bài 6 chương 3.........................................

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Tìm nghiện nguyên của phương trình a) $x^2 - 2y^2 = 5$ b) $x^2 - 5y^2 = 17$ c) $15x^2 - 7y^2n= 9$

Giải các phương trình sau a. $tan^{2}$x + $\frac{3}{cosx}$ = 9 b. 3cos2x - 2cosx - 8 = 0

bài 5 chương 3..........................................

Làm giúp mình phần a, b với ạ Kiến thức: Cộng, trừ phân thức đại số

XI. Rewrite each of the following sentences, beginning as shown, so that its meaning does not change: 1. The Mona Lisa was painted by Leonardo Da Vinci in 1503 or 1504 in Italy. Leonardo painted............................................................................................................................................. 2. Many international artists attended Hue Festival this year. Hue Festival ......................................................................................................................................... 3. I haven’t met my uncle for 5 years. The last time ......................................................................................................................................... 4. I’m sure they will support this programme without hesitation. I’m sure this .......................................................................................................................................... 5. If people eat more fish and vegetables, they will be healthy. The more .............................................................................................................................. ................ 6. The plane was delayed for one hour because the wind was strong. Because of ............................................................................................................................................ 7.Tom is the most active person I’ve ever met. I’ve never ............................................................................................................................................. 8. You should wear a face mask in public places to avoid being injected Covid 19. A face mask ............................................................................................................................................... 9. Though the weather was bad, they still drove their car to work. Bad as ......................................................................................................................................................... In spite of ................................................................................................................................................. 10. The population growth in Tokyo is low. The population growth in New York is lower. The population growth in New York .......................................................................................................

Có 19 người xuống tàu ở trạm đầu tiên. 17 người khác lên tàu. Giờ tổng cộng trên tàu có 63 người. Như vậy, lúc đầu trên tàu có bao nhiêu người?

bài 4 chương 3........................................