Bài 1 Tìm hai số nguyên a b Biết a>0 và a.(b-2)=3 Bài 2 Tìm số nguyên n để 2n + 1 chia hết chon-3

Đánh giá công lao của Lê Lợi & Nguyễn Trãi trong cuộc khởi nghĩa Lam Sơn. Đầy đủ ko thiếu 1 chi tiết

Cho hình thang ABCD có 2 đáy AB và CD, các đường chéo cắt nhau tại O. Chứng minh : OA × OD = OB × OC

67. I’m not good _______ English. I think I should spend more time _______ it. A. in / at B. at / on C. at / in D. on / at 68. How is thing getting ______ ? A. up B. on C. in D. over 69. An umbrella I what I need now, it’s raining . I’ll give it _____ tomorrow. A. up B. away C. back D. over 70. I’ve gone ______ all my pockets but I can’t find the keys. A. on B. off C. through D. of 71. I couldn’t find any place to go ______ holiday. A. at B. for C. up D. on 72. I’m fed ______ doing the same work everyday. A. out of B. forward to C. on to D. up with 73. Have you ever thought ______ giving up smoking? A. over B. of C. on D. at 74. If you don’t know the meaning of the word, you should look it ______ in the dictionary. A. out B. in C. up D. on 75. She has tried ______ several shoes but she can’t find suitable ones. A. at B. in C. out D. on 76. Most countries have brought malaria _____ control with the help of the World Health Organization. A. under B. out of C. below D. in 77. The party begin at 7 o’clock and I’ll pick you _____ at 6: 30. A. on B. up C. away D. Of 78. I come _____ an ancient city, sometimes referred ______ as the Athens of the North. A. on / as B. up / to C. over / to D. from / to 79. The house is ______ fire. Please call ______ for help! A. at / to B. for / at C. on / for D. up / for 80. An apple stand _____ the New York State. A. for B. on C. up D. at 81. She keeps ______ complaining ______ the weather. A. in / of B. on / about C. out / about D. on / in 82. Some pessimistic persons think that the world’s resources will run ____ in some day. A. off B. of C. out D. on 83. Let’s get acquainted _____ the newcomer. A. to B. of C. with D. about 84. We don’t have time to think it ______ . A. on B. up C. out D. over 85. I object ______ being kept waiting. Why can’t you be _____ time? A. at / in B. for / in C. to / on D. at / on 86. You aren’t aware _____ the time, are you ? You are always late ______ work. A. of / for B. for / of C. on / at D. on / for 87. We were confused ______ the cross word puzzles. A. on B. with C. of D. for 88. If someone knocks _____ the door ______ night, don’t open it. A. on / at B. at / at C. up / in D. at / on 89. Everything is available _______ the operation. A. of B. on C. from D. for 90. He is very keen _____ English, but he is not good ______ listening. A. at / on B. on / at C. at / at D. to / of 91. Your hairstyle is quite similar _____ me. A. from B. with C. of D. to 92. Nguyen Du devoted all his lifetime ______ writing. A. for B. to C. in D. from 93. I bought a coat ______ my mother _______ the supermarket. A. from / for B. for / at C. for / from D. for / in 94. She was very surprised ______ the grade she received. A. at B. on C. of D. about 95. We might need more food, depending ______ how many people turn up. A. for B. on C. at D. with 96. Jane doesn’t spend much money ______ clothes. A. over B. about C. at D. on 97. A sign warned motorists ______ dangers. A. of B. for C. about D. A and C 98. They translated the letter ______ French. A. for B. with C. into D. about

Làm giúp em phần f, g, h thôi ạ! Em để lại 30 điểm cho 3 phần đó ạ! Giúp em với ạ! Em cảm ơn ạ!

Ý nghĩa của CẢM ỨNG đối với đời sống của sinh vật

Giúp mình với nha.Sáng mai mik phải nộp bt rồi huhuhu

xét tính bị chặn của hàm un= n -√ n^2-1

Làm giúp mình với cảm ơn.. Giúp mình.

Cho tam giác ABC vuông tại A, đường cao AH. M là một điểm tuỳ ý trên cạnh BC (M khác B, C). Gọi D, E lần lượt là hình chiếu của M trên AB, AC. a, Tứ giác ADME là hình gì? Vì sao? b, Chứng minh rằng: góc C = góc BAH