Đáp án + Giải thích các bước giải:
c)
`P=A.B`
`=>P=(x+2)/(x+3). 1/(x+2)`
`=>P=1/(x+3)(x\ne-3)`
`P` nguyên
`=>1\vdotsx+3`
`=>x+3\inƯ(1)={1;-1}`
`=>x\in{-2;-4}`
Vậy `x\in{-2;-4}` thì `P` nguyên
`P=A*B=(x+2)/(x+3)*1/(x+2)=1/(x+3) ( x ne -3)`
`<=>x +3inƯ(1)`
`<=>x+3in{1;-1}`
`<=>x in {-2;-4}` (tm)
Vậy `x in {-2;-4}` để `P` nhận giá trị nguyên .
I.choose the correct answer. Pompeii is an ancient town in Italy (1) … was destroyed when a volcano (2) … in 79 AD. The lava and ash from the eruption of Mount Vesuvius buried the town along with everything and everyone in it. Most of the site (3) … studied by archaeologists (4) … have uncovered many objects among the ruins. The town is now a popular tourist attraction and is visited (5) … thousands of people each year. They (6) … walk along the streets which (7) … once a part of the busy market town and (8) … now an important part of history 1. A.where B.who C.which 2. A.erupted B.has erupted C.had erupted 3. A.has been B.was being C.has been 4. A.whose B.they C.who 5. A.by B.from C.with 6. A.could B.can C.are able 7. A.was B.have been C.were 8. A.were B.are C.has been
5.Where ………..your mother ? My mother is on the beach • 6. Where is your father now ? He ………at the musuem • 7. Where …………….Mary and Sue ? They are at the theatre • 8. Where………your parents ? They are at the bakery • 9. What is your city like? It……….busy and crowded II. FILL IN THE GAPS WITH : WAS, WERE • 1. Where …………..you yesterday ? I was at the bus stop • 2. Where ………..she last week ? She was at Phu Quoc island • 3. Where ……………he last night? He was at home • 4. Where………………they last summer holiday? They were in HA NOI • 5. Where was your mother yesterday morning?My mother…………..at school • 6. Where ……..was her father last month? He was at the hospital • 7. Where were your brothers yesterday afternoon? • 8.They ……………………..at the supermarket III.When, where, what, how often, how • 1…………….. Is your countryside like? It’s far and quiet • 2………………. did you go on summer holiday? I went to Phu Quoc island • 3. …………..will you be this weekend ? I will be at the park • 4. …………..will you do tomorrow ? I will build sandcastles • 5. …………..is her address? It’s 3, ha huy tap street, Vinh city • 6………………..do you live? I live on the second floor , Hung Thinh tower • 7. ……………….does she live ? She lives at 4, phan boi chau street, vinh city • 8. ……………………do you do homework ? I do homework in the afternoon • 9. …………………..do you go camping? I go camping once a month • 10………………does she go to school ? she goes to school by motorbike IV. DOES / DO / DOESN’T / DON’T • 1. What ……………you do in the morning ? I usually do morning exercise • 2. What …………they do in the afternoon ? They often do karate • 3. What ………..your parents do in the evening ? They always watch TV • 4. What……….Lan and Hoa do in their free time? They usually surf the internet • 5. What ……………she do afterschool ? She studies with a partner • 6. What………….he do before school ? he does her homework • 7. What ………..your mother do in her free time? She reads magazines • 8. Where………….your father go in his free time ? He goesfishing • 9. I ………………get up at 7a.m • 10. They………………………………………..ride a bike to school at 6.30 a.m • 11. She ……………………………. Always watch TV in the evening V.Underline the correct words • 1. My mother sometimes ( cook / cooks ) dinner for my family • 2. She doesn’t ( gets / get ) up late in the morning • 3. He doesn’t ( have / has ) breakfast at 6a.m • 5. Does he ( brush / brushes )his teeth in the morning ? Yes, he does • 6. Do you ( go / goes) shopping in your free time? Yes, I do • 7. My sister sometimes ( wathes / watch ) cartoons in her free time • 8. I often ( catch / catches) a bus to the zoo on sundays • 9. My brother ( wash / washes ) his face in the morning • 10. Where did you go last summer holiday? I ( go / went ) to the airport VI. Change the sentences into negative and questions Ex: + I played football yesterday - I didn’t play football yesterday ? Did you play football yesterday ? Yes , I did / No, I didn’t 1. She swam in the sea last week - ………………………………………………………… ?...................................................................................... 2. He saw some pythons last month - ……………………………………………………….. ?....................................................................................... 3. They ate nice food and drink last night - …………………………………………………. ?.............................................................................. 4. My mother had a birthday party last weekend -……………………………………………………….. ?..................................................................................... 5. I visited ha long bay last year -…………………………………………………………… ?............................................................................................ VII.Look and read. Fill each gap with one word from the box. Write the word next to the number. There is one word that you do not need. There is one example (0). bed up exercise homework partner basketball Hi, my name’s Joe. Every morning I get (0) up early. I do morning (1) _____________, have breakfast and then go to school. Twice a week, I go to the sports centre and play (2) _____________ with my friends after school. In the evening, I often do my (3)_____________ after dinner. Then I watch TV and go to (4) _____________ at around 10 p.m.
Mn làm cho em bài 2 hoặc bài 3 nha :3 (làm cả 2 thì sẽ được CTLHN)
Cho tam giác ABC cân ở A. Trung tuyến AM = 5cm, BC = 8cm a, CM tam giác AMB = tam giác AMC b, CM AM vuông góc vs BC rồi tính AM c, Trên tia đối của tia BC lấy đ I, trên tia đối của tia CB lấy đ Q sao cho BI = CQ. Qua B và C lần lượt kẻ BH và CK vuông góc vs AI và AQ tại H và K. CM BH = CK (VẼ HÌNH TOÀN BỘ CÁC CÂU TRÊN)
Mình cần gấp ai giúp mình zới🥺
Mng giúp mình ba câu này với ạ, mình cảm ơn nhìu
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advantages and disadvantages of online studying
CM định lý ........................
Cho hình vẽ sau biết AB//DE. Tính ACDˆ.
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