Tìm x biết :|(x-1).(x+5)|=3|x-1|

CM:f(x)=$x^{2}$ -2x+2 Vô nghiệm

Cho tam giác ABC trung tuyến BM,CN biết rằng BM vuông góc CN đường cao AH cmr 4/AH^2=1/BM^2+1/CN^2

giải hộ mình bài này với ạ 1,Cho mạch điện như hình vẽ trong đó R1 = 15 ôm,R2=3 ôm,R3=7 ôm và R4 = 10 ôm. HĐT Uab=35V. a. tính điện trở tương đương của đoạn mạch b,Tìm cường độ dong điện qua các điện trở

Cm : n^n-n^2+n-1 chia hết cho (n-1)^2 vs mọi n và n>1

giúp mik câu này với học tập để làm j

GIÚP MIK LM BÀI I, II nha. LM 1 câu cx đc nha

BÀI TẬP VỀ MỆNH ĐỀ QUAN HỆ (RELATIVE CLAUSES) 1) The book __I bought at the bookstore yesterday is expensive. A. who B. whose C. that D. B & C are correct 2) What’s the name of the blonde girl __ just came in A. who B. whose C. whom D. A & B are correct 3) I don’t like people __ lose their tempers easily. A. who B. whose C. that D. A & C are correct 4) Mexico City, ____ has a population of over 10 million, is probably the fastest growing city in the world. A. which B. whose C. that D. A and B ARE Correct 5) This is Henry, __ sister works for my father. A. who B. whose C. that D.All are correct 6) He’s the man __ people like at first sight. A. who B. whom C. that D. A & C are correct 7) Could you iron the trousers __ are hanging up behind the door A. who B. which C. that D. B & C are correct 8) Where is the girl __ sells tickets? A. who B. whose C. whom D. A & C are correct 9) The man____ we consider our leader had much experience in climbing mountains. A. who B. whose C. whom D. A & C are correct 10) The artist __ name I couldn’t remember was one of the best I had ever seen. A. who B. whose C. that D. A & C are correct 11) Frank invited Janet, __ he had met in Japan, to the party. A. who B. whose C. that D. A & C are correct 12 The girl __design had been chosen stepped to the platform to receive the award. A. whose B. whom C. that D. which 13) I need to find a painting __ will match the rest of my room. A. whose B. whom C. who D. which 14) There are too many poor people __ do not have enough to eat in the world. A. whose B. whom C. who D. which 15) The trees __ have the beautiful flowers grow near the gate of the garden. A. whose B. whom C. who D. which 16) The teacher ___ teaches us French is coming today. A. whom B. who C. that D. B & C are correct 17) What’s the music to ___ you are listening? A. whose B. which C. that D. B & C are correct 18) I don’t like the stories ___ have unhappy endings. A. who B. which C. that D. B & C are correct 19) The students __ don’t have library cards can’t borrow books from the library. A. who B. which C. whom D. A & C are correct 20) Betty is the most intelligent girl __ I have ever met. A. who B. whom C. that D. All are correct 21) Do you know the music __ is being played on the radio? A. who B. which C. that D. B & C are correct 22) This channel often shows the cartoons of __ the children are very fond. A. whom B. which C. that D. B & C are correct 23) The dress __ she bought last week doesn’t fit her well. A. whom B. which C. whose D. B & C are correct 24) Do you know a shop __ sells good coffee? A. which B. that C. whose D. A & B are correct 25) The teacher punished the student ____ was naughty. A. whom B. who C. which D. A & B are correct 26) She felt in love with a man __ was from another country. A. who B. whom C. which D. whose 27) I like to write to friends ____ are living far away from me. A. who B. whom C. that D. A & C are correct 28) I bought some pencils ____ are in different colours. A. whose B. which C. that D. B & C are correct 29) She ate an apple __ was still green. A. who B. which C. whose D. whom 30) This is my beloved school __ I studied when I was young. A. which B. that C. where D. A & B are correct 31) Here’s the paper ____ you need. A. whom B. that C. who D. whose 32) The woman ____ has been arrested lives in an apartment. A. that B. which C. whom D. A & C are correct 33) The teacher notices the students ____ often come to class late. A. that B. which C. who D. A & C are correct 34) The house in ____ I was born is for sale. A. which B. whom C. that D. A & C are correct 35) That is the chair ____ he used to sit on for meals. A. which B. whose C. that D. A & C are correct 36) What is the picture ____ you are looking at? A. which B. when C. whose D. A & C are correct 37) In the middle of the village, there is a well from ____ the villagers take water to drink. A. that B. which C. whom D. A & B are correct 38) There is a NO PARKING sign ____ I did not take notice of .A. that B. which C. who D. A & B are correct 39) I must thank the people ____ I got the present from. A. who B. whom C. that D. All are correct 40) Do you know the doctor for ____ I send? A. whom B. that C. who D. All are correct 41) The man about ____ I was telling you is standing over there. A. who B. that C. whom D. All are correct 42) The woman ____ Ann must take care of is very poor and old. A. whom B. that C. who D. All are correct 43) This is the man to ____ I gave some money this morning. A. who B. whom C. that D. All are correct 44) This is the result of our work ____ I’m pleased with. A. that B. whose C. which D. A & C are correct 45) The problem in ____ we are very interested has been discussed in class. A. that B. whom C. which D. A & C are correct 46) The boy ____ you made fun of yesterday is my cousin. A. who B. whom C. that D. All are correct

Bài 1: Nhiệt phân hoàn toàn hỗn hợp gồm BaCO3, MgCO3,Al2O3 được chất rắn A, khí B. Hòa tan chất rắn A trong nước dư, thu được dung dịch C và kết tủa D. Sục khí B dư vào dung dịch C thấy xuất hiện kết tủa.Hòa tan kết tủa D trong dung dịch NaOH dư thấy tan một phần. Viết phương trình hóa học của các phản ứng xảy ra. Bài 2: Hỗn hợp X gồm BaO, Al2O3, Na2CO3, MgCO3 có số mol bằng nhau. Hòa tan hỗn hợp X vào nước thu được chất rắn A và dung dịch B.Cho từ từ dung dịch HCl vào dung dịch B thấy xuất hiện kết tủa, sau đó kết tủa tan.Nung chất rắn A đến khối lượng không đổi thu chất rắn D.Hòa tan D vào H2O thấy D tan một phần.Dùng phương trình hóa học để giải thích các thực nghiệm xáy ra.

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