Đáp án+Giải thích các bước giải:
`xy(x-y)+yz(y-z)+zx(z-x)`
`=xy(x-y)+y^2z-yz^2+xz^2-x^2z`
`=xy(x-y)+(y^2z-x^2z)+(xz^2-yz^2)`
`=xy(x-y)-z(x^2-y^2)+z^2(x-y)`
`=xy(x-y)-z(x-y)(x+y)+z^2(x-y)`
`=(x-y)[xy-z(x+y)+z^2]`
`=(x-y)(xy-xz-yz+z^2)`
`=(x-y)[x(y-z)-z(y-z)]`
`=(x-y)(y-z)(x-z).`
`\qquad xy(x-y)+yz(y-z)+zx(z-x)`
`=y[x(x-y)+z(y-z)]+zx(z-x)`
`=y(x^2-xy+zy-z^2)+zx(z-x)`
`=y[(x-z)(x+z)-y(x-z)]+zx(z-x)`
`=y(x-z)(x-y+z)+zx(z-x)`
`=(z-x)[-y(x-y+z)+zx]`
`=(z-x)(-xy+y^2-zy+zx)`
`=(z-x)[-y(x-y)+z(x-y)]`
`=(z-x)(x-y)(z-y)`
VI. Chuyển các câu với động từ chỉ nhận thức sau sang câu bị động 64. I have heard her sing this song several times. 65. People saw him steal your car. 66. The teacher is watching the work. 67. He won’t let you do that silly thing again. 68. People don’t make the children work hard. 69. They made him work all day. 70. The detective saw the woman putting the jewelry in her bag. 71. The terrorists made the hostages lie down. 72. Police advise drivers to use an alternative route. 73. She helps me to do all these difficult exercises.
Mọi người làm giúp mik bài này vs ạ, plssssssssss
Complete the sentences with the to-infinitive or-ing form of the verbs in brackets
Giải giúp mình với ạ. Giải theo cách tự luận nha. Mình cảm ơn
Viết đoạn văn khoản 10 câu có dung 3 loại đại từ khác nhau. Chủ đề đoạn văn nói về tình bn. Giúp mik vs ạ.
Có những phương pháp chế biến nông sản nào? A.Đóng hộp,muối chua,sấy khô,tinh bột B.Chỉ cần đóng hộp và sấy khô là bảo quản tốt C. Để nơi thoáng mát là đủ D.Chế biến thành tinh bột và muối chua
Hai tổ sản xuất phải dệt 140 áo len. Trong thực tế tổ I đã vượt mức 10% kế hoạch của mình, tổ 2 vượt mức 5% kế hoạch của mình nên cả hai tổ đã dệt được 150 áo len. Hỏi theo kế hoạch thì mỗi tổ phải dệt bao nhiêu áo len?
b 34 nhân 456 c 746 nhân 653 d 1287 nhân 335 e 1092 :92 f 2059 :17 bài 2 c) 125 nhân 56 d) 2021 nhân 25 nhân 4 e) 476 nhân 125 nhân 8 bài 3 b) 45 nhân 12 c) 21 nhân 49 d) 19 nhân 8 e) 47 nhân 98 f) 15 nhân 998 các bạn giúp mình với
Viết lại câu sử dụng từ trong ngoặc 2.There is no building in the city higher than this (highest) 3Miss Lan likes gardening more than fishing (prefer) 4. Because Hoang was lazy, he failed the exam (because of) 5. I started learning English 3 years ago ( for)
II. Circle the best answer 1. Your hat doesn’t go ________your clothes. A. up B. with C. of D. down 2. The plane will ________ at 06.30 so you must be there at 06.00. A. take after B. take down C. take off D. take up 3. The thieves waited until it was dark enough to ___________his house yesterday. A. broke into B. broke out of C. broke away D. broke through 4. The bomb missed it mission then __________. A. went down B. went off C. went through D. went away 5. The earth is a(n) ___________. A. satellite B. state C. planet D. star 6. I borrowed this coat _________my father. A. from B. to C. at D. by 7. If you need an extra bed for your guest, you can use one of __________. A. our B. us C. ours D. we 8. We went by car but the children went _________foot. A. on B. by C. to D. with 9. Buddhism is an __________. A. group B. religion C. association D. imagination 10. Lan ________the peaceful atmosphere while Maryam was praying. A. enjoying B. has enjoyed C. enjoyed D. enjoy 11. I wish I ______ you some money for your rent, but I am broke myself A. can lend B. would lend C. could lend D. will lend 12. There are several books by Hemingway on this __________. A. shelf B. platform C. cupboard D. support 13. I was so tired that I ________asleep in the chair. A. got B. felt C. went D. fell 14. The players ________to be there at 3 o’clock. A. told B. were told C. have told D. tell 15. Do you ______me say this in class? A. let B. allow C. permit D. mind 16. He forced all his children ________hard till midnight. A. to study B. studied C. study D. studying 17. I am always _________for school. A. on time B. in time C. at time D. out of time 18. I was having a rest when the volcano_________. A. exhibited B. exhausted C. exhaled D. erupted 19. We _________ an English exercise. A. are doing B. did C. have done D. all are correct 20. He usually worn a pair of glasses. A. He no longer wears a pair of glasses. B. He used to wear a pair of glasses. C. He doesn’t wear a pair of glasses anymore D. All are correct 21. They wanted to know if the woman had died of the rare _________. A. illness B. pain C. ache D hurt. 22. “ I wish I _________stay longer,” Maryam said to Lan at the end of the week A. could B. can C. will D. may 23. Malaysia is divided ________2 regions A. to B. on C. in D. into 24. Maryam was really ________ by the beauty of Ha Noi. A. impressed B. impress C. impression D. impressive 25. The United States has a ________ of around 250 million. A. population B. separation C. addition D. introduction 26. Vietnamese people are very ________ . A. friend B. friendless C. friendly D. friendship 27. We were having dinner ________ the telephone rang. A. when B. while C. until D. since 28. I ________call you as soon as I come back home. A. have B. will C. am D. is going 29. Would you mind ________the door? A. open B. opened C. opening D. to open 30. My family loves this house. It ____ the family home since my grandfather built it 60 years ago. A. was B. is C. has been D. will be
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