Cho `a,b,c` là các số thực dương thỏa mãn `abc=\frac{2}{3}` `CMR:\frac{ab}{a+b}+\frac{bc}{b+c}+\frac{ac}{a+c}≥\frac{a+b+c}{a^3+b^3+c^3}`

Cali: Vui. NL: Hôm nay tui học Sử đc 9 điểm mn ạ và vừa rồi tui lại đc 9đ Tin. Niềm vui nâng lên `\text{~Giúp tui nha~}`

Giải quyết bt này mk vs mik đang cần gấp a =)))

Giải các phương trình sau: a, (4x – 10)(24 + 5x) = 0 b, (3,5 – 7x)(0,1x + 2,3) = 0

Giải giúp mình với cảm ơn nhiều lắm luôn ạ

Bài: Hai góc đối đỉnh Cho hai đường thẳng và $xx^{,}$ và $yy^{,}$ cắt nhau tại O. Oz là tia phân giác của góc xOy. $Oz^{,}$ là tia đối của tia Oz. Chứng minh rằng $Oz^{,}$ là tia phân giác của góc $x^{,}$O$y^{,}$ Các bn vẽ hình thui nha

Calli: Phiền NL: Phiền thật sự :)

Giải hộ em với ạ gấp ạ em cảm ơn nhiều

help me 60. What _______ if you found a burglar in your house? A. do you do B. you do C. would you do D. you would do 61. He would get fat if he_______ smoking. A. kept on B. keeps on C. keep on D. could keep on 62. If you_______ someone drowning what would you do? A. see B. seen C. had seen D. saw 63. I_______ ruined her if I bought her everything she asked for. A. were B. will be C. would have been D. would be 64. I _______ a job easily if I_______ a degree. A. could get/ have B. can get/ had C. could get/ had D. can get/ had had 65. The whole machine _______ into pieces if you_______ that screw quickly. A. felt/ remove B. will fall/ removed C. would fall/ removed D. would fall/ remove 66. I’d go and see him more often if he_______ on a bus route. A. lives B. lived C. had lived D. living 67. What would you have done if the lift_______ struck between two floors at that time. A. had got B. got C. gets D. getting 68. If you knew you had only six weeks to live, how _______ such a short span? A. did you spend B. will you spend C. would you spend D. would you have spend 69. I’d climb over the wall if there_______ so much broken glass on top of it. A. were B. had been C. are D. is 70. If I had known that you were in hospital, I____you. A. will visit B would have visited C. visit D. don’t visit 71. You would have seen my garden at its best if you_______ here last week. A. were B. are C. had been D. be 72. I shouldn’t have believed it if I_______ it with my own eyes. A. had seen B. saw C. hadn’t seen D. didn’t see 73. If I_______ a map, I _______ the way to the Post Office. A. had had/ would have lost B. had had/ wouldn’t have lost C. had/ won’t lose D. have/ wouldn’t have 74. If I_______ that you were coming, I’d have baked a cake. A. know B. knew C. had known D. didn’t know 75. If I_______ ready when he called, he would have taken me with him. A. were B. be C. am D. had been 76. I_______ a taxi if I _______ that it was a long way. A. will take/ realizes B. would take/ doesn’t realize C. wouldn’t have taken/ had realized D. wouldn’t take/ realized 77. If you_______ the instructions carefully, you wouldn’t have answered the wrong questions. A. read B. had read C. reads D. to read 78. I could repair the roofs myself if I_______ a long ladder. A. have B. had C. has D. had had 79. If you had touched that electric cable you_______ electrocuted. A. will be B. would be C. would have been been D. would have be 80. I_______ things on the installment system if I were you. A. wouldn’t buy B. wouldn’t have bought C. won’t buy D. don’t buy 81. If anyone attacked me, my dear dog____at his throat. A. would bite B. will bite C. bit D. had bitten 82. Had you left that wasp alone, it_______ you. A. would have stung B. wouldn’t sting C. wouldn’t have stung D. would sting 83. Unless I _______ that the traffic lights were red, I_______. A. had realized/ would have stopped B. had realized/ wouldn’t have stopped C. realized/ would stop D. realize/ will not stop 84. If you ……… me that he had never paid his debts, I_______ him the money. A. had told/ wouldn’t have lent B. had told/ wouldn’t have been lent C. tell/ will not lend D. told/ would lend 85. If you_______ ,he wouldn’t have known that we were there. A. didn’t sneeze B. won’t sneezed C. doesn’t sneeze D. hadn’t sneezed 86. If you_______ some mustard in the sandwiches, they would have tasted better. A. put B. puts C. had put D. putting 87. The hens_______ into the house if you had shut the door. A. couldn’t get B. couldn’t have got C. will not get D. doesn’t get 88. Had you known that the river was dangerous, he_______ to swim across it. A. would have tried B. would try C. will not try D. wouldn’t have tried 89. _______ more slowly, he might have understood you. A. Had you spoken B. Did you speak C. If you speak D. If you spoke 90. If he had known the whole story, he_______ so angry. A. would have been B. wouldn’t have been C. wouldn’t be D. would be 91. Or you had been in such a hurry, you_______ sugar into the sauce instead of salt. A. will not put B. would put C. wouldn’t have put D. put 92. If I_______ ready when he called, he would have taken me with him. A. were B. be C. am D. had been 93. Unless you_______ at the engine for a moment, you would have seen what was missing. A. hadn’t looked B. didn’t look C. look D. looked 94. Daisy_______ by her enemies or the geese had cackled so loudly. A. would have been captured B. wouldn’t have been captured C. will have been captured D. won’t have been captured 95. He would have been arrested by the policemen if he…………………. to leave the country. A. doesn’t try B. tries C. had tried D. hadn’t tried

Cho tam giác abc, góc a lớn hơn 90 độ.Gọi d,e,f theo thứ tự là chân đường cao kẻ từ a,b,c.chứng minh: a)a,d,b,e cùng nằm trên một đường tròn. b)a.,d,c,f cùng nằm trên 1 đường tròn. c)b,c,e,f cùng nằm trên 1 đường tròn