Tìm các giá trị của tham số m để các phương trình sau có hai nghiệm phân biệt trái dấu Câu a (m^2−1)x2+(m+3)x+(m^2+m)=0

làm cho em hết bài 9 em cảm ơn

Giải giúp em bài này với ạ, em đang cần gấp lắm. Mong mọi người giúp em ạ

viết các công thức rơi tụ do? lấy 1 ví dụ?

Ex1: Put the words in the correct order: 1. she/ go/ How/ yesterday?/ did/ to/ school/ - By/ bike./ 2. buy/ Where/ this/ did/ he/ hat?/ the/ - In/ supermarket./ 3. your/ did/ it/ How long/ finish/ to/ take/ you/ homework?/ - Two/ hours./ 4. do/ need/ a/ Why/ phone card?/ you/ - I/ need/ parents./ to/ phone/ Because/ my/ 5. is/ Lai Chau/ How far/ to/ it/ from/ Hanoi?/ – 3 kilometres./ 6. did/ see/ last/ Who/ night?/ you/ - old/ friend,/ My/ Tom./ 7. neighbor/ What/ give/ did/ her/ her/ - A/ flower./ bunch/ of/ 8. did/ return/ When/ to/ they/ America?/ - Yesterday./ 9. Mr.Robinson/ What/ did/ buy?/ - An/ dictionary./ English/ 10. was/ father/ Where/ last/ your/ month?/ - In/ Hanoi./ Ex2: Read the text about New Year's Ever in Hong Kong and decide whether the staments are true (T) or false (F): I'll never forget my visit to Hong Kong. When I arrived, everybody was very busy with preparations involved. The atmosphere was fantastic. There were bright colours and delicious smells everywhere. The local people were cleaning every corner of their houses and decorating the walls with red pieces of paper. Another custom is to cook fish on New Year's Ever and eat the next day. My friend told me that they wanted to have something to eat on the first day of the year. I was really looking forward to New Year's Eve Dinner. The whole family got together and everyone was really happy. I noticed that the grandparents and parents gave children red envelopes with money inside. After dinner they all started playing cards for good luck. Nobody went to sleep before midnight. At midnight the great event begins: fireworks! I was really amazed. All around the city I could see and hear colourful fireworks. It was incredible and I was really excited. T F 1. The local people decorated the corners of their houses with red pieces of paper. 2. People cooked fish to eat on New Year's Eve. 3. The parents and grandparents gave their children red envelopes with money inside. 4. People didn't go to bed before midnight. 5. The card games began at midnight.

trong công thức Momen lực, Cánh tay đòn là gì?

Mọi người giải giúp mình 2 câu này với

viết pt đường thẳng d biết d // với đường thẳng y=3x-2 và cắt trục hoành tại điểm có hoành độ =1

Cho tam giác ABC có AB=6cm,AC=8cm,BC=10cm. a)Tam giác ABC là tam giác gì?Vì sao? b)So sánh ba góc của tam giác ABC

Nêu các quy tắc an toàn khi sử dụng điện?