Giúp mình với. Mình đang cần rất gấp

Tìm x biết: (1/1.2.3.4+1/2.3.4.5+1/3.4.5.6+...+1/7.8.9.10).x=119/720 Các bn nhớ giải thích rõ ràng nhé! {60đ}

Nhờ các a chị giải hộ e phân số này với ạ. 3-3/4+3/2=

54. I saw her …….. the staff room. A. to enter B. enter C. entering D. entered 55. Would you mind ……….. the window? A. open B. opening C. to open D. opened 56. We saw the first star …………… in the sky. A. twinkling B. twinkle C. to twinkle D. twinkled 57. It’s no good ………. to him, he never answers letters. A. write B. being written C. writing D. to write 58. Ask him to come in. Don’t keep him ………. at the door. A. to stand B. standing C. stand D. being stood 59. The children loved ……. the old castle. A. discovering B. exploring C. hunting D. detecting 60. He devoted most of his time …….. novels. A. to having written B. to write C. to writing D. to have written 61. Who suggested ……. here for the picnic? A. come B. came C. to come D. coming 62. He pursuaded his friend ……….. for a job. A. look B. looking C. to look D. looked 63. She invited me …… and stay with her whenever I visited Da Lat. A. come B. coming C. to come D. came 64. His mother reminded him ………. the door before going out. A. lock B. to lock C. locked D. to be looked 65. At last, he admitted ……… that box. A. to open B. open C. to be open D. opening 66. My father told me ………. him when he was talking with his friends. A. not to interrupt B. not interrupting C. not be interrupted D. not interrupt 67. His sister asked him ……… too fast. A. not drive B. not to drive C. not to be driven D. not driving 68. My mother wanted me ……. a doctor. A. become B. becoming C. to become D. became 69. She agreed ………. me with my English. A. to help B. help C. helping D. to be helped 70. The librarian reminded me ………. the book back to the library. A. to give B. give C. giving D. to be given 71. Tom wanted me ……….. to the seaside with him. A. to go B. go C. going D. went 72. Many students expected their teachers …… and interested in what they were doing. A. to be motivated B. be motivated C. to motivate D. motivated 73. Almost students believed that learning should ……….. on important life skills. A. centered B. be centered C. be centering D. center 74. My mother advised me not ……. to bed late. A. go B. going C. went D. to go 75. She invited me …… to her birthday party. A. come B. to come C. coming D. came 76. The librarian asked us ……. noise in the library. A. not make B. not to make C. not making D. not to be made 77. She encouraged me ……. the exam. A. to take B. take C. taking D. took 78. John asked me not …… anyone the news. A. tell B. to tell C. telling D. told 79. My close friend invited a lot of people ………. her party. A. to B. in C. with D. on 80. I am glad you decided ……… to my party. A. come B. coming C. came D. to come

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Làm ơn giúp mình với, sắp toang rồi!

Giúp mình bài 3 , mình xin cảm ơn trước

Giải phương trình nghiệm nguyên : x^2 +y^2 -x-y = 8

Tìm các cặp số nguyên x, y thoả mãn: xy + 5x -7y = 35 Mình hứa vote và cảm ơn đầy đủ cho các bn giải giúp mình thank!