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$f(x)=(3-m)x^2-2(m+3)x+m+2$ Tìm m để: a/f(x)=0 vô nghiệm b/ f(x)=0 có 2 nghiệm c/ f(x)=0 có 2 nghiệm dương phân biệt d/ f(x) ≤ 0 (∀x ∈ ℝ) Mọi người chỉ cần làm mình câu a/ thôi ạ. Mấy câu còn lại cho mình công thức để làm.

Nêu cảm nhận của em về 2 câu cuối bài thơ "Ngắm Trăng"

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Em hãy viết một bài văn giới thiệu về hoa đào - Ko chép mạng ( nếu chép chỉ đc 2 sao) - Ko quá dài cũng như quá ngắn

VI..Read the text and then choose the best answer A, B, C or D. Geoffrey Hampden has a lot of friends and is very popular at parties. Everybody admires him for his fine sense of humor, except his six- year- old daughter, Jenny. Recently, one of Geoffrey’s closet friends asked him to make a speech at a wedding reception. This is the sort of thing that Geoffrey loves. He prepared the speech carefully and went to the weeding with Jenny. He included a large number of funny stories in the speech and of course, it was a great success. As soon as he finished, Jenny told him she wanted to go home. Geoffrey was a little disappointed by this but he did as his daughter asked. On the way home, he asked Jenny if she enjoyed the speech. To his surprised, she said she didn’t. Geoffrey asked her why this was so and she told him that she did not like to see so many people laughing at him! 1.Why is Geoffrey very popular at parties? A. Because he has a fine sense of humour. C. Because he has a lot of friends. B. Because he can make a good speech. D. Because he is admired by everybody. 2. What was he invited to do one day? A. To go to a wedding. B. To make jokes at a party. C. To make a speech at a wedding reception. D. To prepare a speech. 3. What is Geoffrey interested in? A. Going to weddings. C. Making jokes B. Making speeches at his friends’ weddings. D. Teasing his friends. 4. How did Geoffrey feel when his daughter asked him to take her home after his speech? A. annoyed B. bored C. Terrified D. Disappointed 5. What did Geoffrey’s daughter really dislike? A. Her father’s speech. B. The way her father made jokes. C. The wedding. D. Seeing people laughing at her father

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Em có đồng ý với câu: những định hướng nghề nghiệp em chọn cho mình hôm nay chưa chắc nó có thể tồn tại đến ngày mai vì sao? Giải nhanh hơ m nha .....😘😘😘😘 hứa cho đủ tiền với vàng ....thank........

1) Hòa tan 11,2g Fe vào dd chứa 0,9 mol HNO3 đun nóng chỉ thu được khí màu nâu đỏ duy nhất.Tính khối lượng muối tạo thành 2) Hòa tan 14g Fe vào dd chứa 1,1 mol HNO3 thu đc V lít NO2.Tìm V 3)Hòa tan a gam Fe vào dd chứa 8a(g) HNO3 thu được khí không màu duy nhất, khi đưa khí này ra ngoài thì hóa nâu.Vậy sau pứ thu được sản phẩm gì

Mọi người giúp mình câu 8 với ạ!