Đáp án:
Giải thích các bước giải:
Ta có :
`x + y = x . y`
`-> x = xy -y = y(x-1)` ( Đặt `x` ra ngoài làm chung )
Mà `x + y = x : y`
`-> x + y = y(x-1) : y = x-1`
`-> x + y = x-1 -> x -x = y +1 -> y +1 =0 -> y =-1`
Khi đó :
`x - y = x . y`
`-> x + 1 = -x`
`-> x +x = -1`
`-> 2x = -1 -> x = -1/2`
Vậy `x = -1/2` và `y =-1`
giúp mình vs ạ plsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
Bài 5 : Chia động từ thì Hiện tại tiếp diễn để nói về những dự định, kế hoạch trong tương lai. 1. Sue……..(come) to see us tomorrow. 2. I …………….(not work) this evening. 3. My friends ………….( travel) to York at the weekend. 4. She ……………….( leave) at 3 o’clock . 5. Our grandmother…………….( visit) us at Christmas. 6. He ……………( pick) me up at one o’clock. 7. I…………..( visit) my grandmother next summer. 8. What………we …………(prepare) for dinner? 9. Where…………you………….( go) for your vacation. 10. My father………..( drive) to Manchester on Friday. Bài 6 : Dựa vào gợi ý trong ngoặc, hãy trả lời các câu hỏi dưới đây để nói về kế hoạch vào tuần sau của Ms. Kim. Đừng quên sử dụng cấu trúc câu thì hiện tại tiếp diễn. 1. What is Kim doing on Monday evening? ( to meet Tom) ______________________________________ 2. What is she doing on Tuesday afternoon? ( to look after Carol’s kids) ______________________________________ 3. What is she doing on Tuesday evening? ( play badminton) ______________________________________ 4. What is she doing on Wednesday morning? ( see the dentist) ______________________________________ 5. What is she doing on Wednesday evening? ( work late) ______________________________________ 6. What is she doing on Thursday afternoon? ( pick up Jen from the airport) ______________________________________ 7. What is she doing on Friday evening? ( go to a concert) ______________________________________ 8. What is dhe doing on Saturday morning? ( go on a sight-seeing tour with Jen). ______________________________________ 9. What is she doing on Saturday evening? ( organise a party) ______________________________________ 10. What is she doing on Sunday morning? ( take Jen to the airport) ______________________________________ .
1. Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. Question 3: A. prison B. include C. wonder D. valley 2.Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. Question 4:A. festival B. concern C. connect D. compile 3.Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 5: Mr. Smith got up early ________to get to the meeting on time. A. in order B. so that C. in order to D. so as to 4.Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 6: Mr. Lam asked me if I ________ him this dictionary. A. give B. to give C. gave D. giving 5.Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 7: What time _______ Miss Lien be here tonight? A. was B. are C. will D. does 6.Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 8: Would you mind ________ the washing up for me tonight? A. do B. doing C. did D. to do 7.Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 9: He fell off the tree and________ .A. was injured B. were injure C. were injured D. was injure 8.Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 10: Will you _____________ the window, please?A. to open B. open C. opens D. opening 9.Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 11: It’s difficult ________ that exercise.A. do B. to do C. does D. doing 10.Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 12: The girl ________ next to Lan is a new student.A. standing B. stand C. to stand D. stands
tả khu vui chơi giải trí mà em thích NO COPY ; HAY ,NGẮN GỌN = CTLHN ,5 SAO
Cho 2 đa thức A(x)=-3x^2-2x^4-2+7x và B(x)=3x^2+4x-5+2x^4 a) hãy sắp xếp các hạng tử của mỗi đa thức trên theo lũy thừa giảm dần của biến b) tính M(x)=A(x)+B(x). Tìm x để M(x)=4 c) tìm đa thức C(x) sao cho C(x)-B(x)=-A(x)
Tìm x, biết: (x+1)x^3-x(x-2)^2+x-1=0
Làm ơn ! mọi người giải giùm tôi , tôi có việc gấp. TÔI cho mọi người 5 sao .
Find the mistake: 1/ Jane (A) told me that she (B) will (C) have to go to London the(D) following day. 2/ Tom (A) together with his two sisters, (B) are going (C) to join our trip ( D) next weekend
vẽ con gián cho mình đi NL : Đang học nhìn thấy con gián...
cho a và b là các số tự nhiên có 4 chữ số. thỏa mãn a = 5.b . tìm giá trị bé nhất và lớn nhất của tổng a+b
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