Phân tích đa thức thành nhân tử bằng phương pháp đổi biến a,x^4+4x^2+3x+4 b,x^4-4x^2-5x-4 c,x^4-4x^2+5x-4 giúp mình với

Làm giúp mình với con các tiết pk dễ đọc nha

Câu 5. Sục 2,24 lít khí CO2 (ở đktc) tác dụng vừa đủ với 200ml NaOH tạo thành muối trung hòa. a) Tính khối lượng muối thu được. b) Tính nồng độ mol của dung dịch NaOH đã dùng

Tìm số nguyên tố $\overline{abcd}$ sao cho ab, cd là các số nguyên tố và b² = $\overline{cd}$ + b -c

Giúp mk vẽ hình nha: Cho ∆ABC nằm trong mặt phẳng (P). Gọi Bx, Cy là 2 nửa đường thẳng song song và nằm cùng 1 phía với (P). M, N là 2 điểm di động lần lượt nằm trên Bx, Cy sao cho CN = 2BM

Mn ơi Giúp em vs ạ Lâu ngày ko học nên h lú rồi

nêu các lực tác dụng lên 1 con chim cánh cụt trong hai trường hợp khi nó nằm lơ lửng trong nước biển và khi nó đứng trên tảng băng

Giúp mik câu này với ạ 1/They....usually...(not go) to school by bike 2/The cat...(catch) mouse 3/My old friend, Manh.....(write) to me twice a month

"Hôm sau lão Hạc.....Lão hu hu khóc" Câu 4: Phải bán chó, lão Hạc mắt "ầng ậng nước", rùi "hu hu khóc". ông giáo thì "muốn choàng lấy lão mà òa lên khóc ". Hãy so sánh và chỉ ra ý nghĩa của tiếng khóc cùng nhg giọt nc mắt này

No longer ______ for that company. a. does he works b. works he c. does he work d. he works 20/ The bill ______ before the fifth of the month. a. had to pay b. had to be paid c. had paid d. paid 21/ The tea was ______ hot for her to drink. a. so b. enough c. too d. very 22/ If it doesn’t rain, they ______ for a picnic. a. would go b. have gone c. go d. will go 23/ It was ______ a crazy story that nobody believed it. a. so b. very c. such d. too 24/ Their crop was ______ good that they decided to give a party. a. very b. too c. such d. so 25/ She asked how long it would take us ______ there. a. to get b. to getting c. getting d. get 26/ Mrs Reed ______ on the radio in her car while she was driving home yesterday. a. was turning b. turning c. turned d. turns 27/ She was listening to some music when she suddenly _____ a siren. a. heard b. hears c. hearing d. hear 28/ She looked in her mirror ______ an ambulance behind her. a. saw b. and see c. and was seeing d. and saw 29/ She immediately ______ her car to the side of the road and waited for the ambulance to pass. a. pulls b. pulled c. pulling d. to pull 30/ I ______ such a stupid person. a. have seen never b. have never seen c. never have seen d. see never < VI >: Identify one underlined word or phrase that is incorrect: 1. Despite¬ taking a taxi, Bill arrive late for the concert. a b c d 2. She worked too hard that she became ill. a b c d 3. It was such good book that I couldn’t put it down. a b c d 4. The man was injured in the accident was taken to the hospital. a b c d 5. She sings more better than you do. a b c d 6. Nam didn’t want to go on vacation, so he stays at home all week. a b c d 7. Tom watches usually television in the evening. a b c d 8. These puplis never are late for school. a b c d 9. It was an extremely frightened experience in my life. a b c d 10. Mark went on working in spite he felt unwell. a b c d (giúp mình với mn)