cho 2^n-1 là số nguyên tố. Chứng minh n cũng là số nguyên tố. (2^n-1 là số nguyên tố nghĩa là trường hợp nó là số nguyên tố chứ không phải sai đề đâu nhé)

The day was so_______that we decide to take a picnic lunch to the beach. A. warm and clearly. B.clear and warm C.clear and warmly. D.clearly and warm

1/17.(-84)+17.(-16) 2/15.76-15.16 3/-37.(-24)+37.76 4/1975.(-5)+1975.15 5/79.89-79.(-11) 6/ 48.195-48.95 7/ 157.17-157.7 8/ 15.(-176)+15.76 9/ 47.(-147) -47 .(-47) 10/ 153.177-153.77

Một vật dao động điều hòa với phương trình x=10cos(πt+π/6) trong 4.5 s đầu tiên vật đi qua vị trí có động năng bằng mấy lần thế năng

viết đoạn văn ngắn nói về gia đình

①Rewrite the following sentences, beginning á shown so the meaning stays unchanged 1: I met him for the first time in 1999. >I had not.. 2: Unless he phones his wife immediately, he won't get any information. >If.. 3: " I am sorry I was late" He said >He apologised.. 4: I am sure he didn't do It on purpose > He can't.. 5: "You can leave early". Mi Benson said to Alison > Mr Benson let... 6: " We will go on strike" the Workers said > The workers threatened.. 7: Mrs Edwards is the owner of the car >The car.. 8: The station clock showed half past ten >According.. 9: My Father no longer goes to work by motorbike > No longer.. 10: " Don's try to break the law " said the father to the son > The father ②use the cues to make complete sentences 1:Since /wife/ die/ 1987 / Charle/ live/ alone 2: By last week /price /increase/twenty -six pence 3: It /be/ wettest summer/ France /fifteen years 4: As so as /people /begin /make things/ sell /advertising/ found/ useful 5: American women / always / shake hands / when they/ introduced / men

Cho biểu thức : B = -7/n - 2 a, Tìm n nguyên để B là phân số b,Tìm n nguyên để B là số nguyên

1 Give the correct form of the words in brackets A____statue stands in the middle of the pagada (life) The weather was excelent and we had an extremely___holiday (enjoy) Many people still rafuse to belive that smoking is ____(harm) If you brun the garbage, it will give off____odour (poison) Some children have to suffer from life time_____(abnormal) giúp mình với ạ

(x+3)^2-(x-2)^2=16 (4x-2)^2-(x+4)(x-4)=0 (5-2x)+4(x^2-2)=10

Xác định hàm số y=ax+b biết đồ thị hàm số đi qua điểm (2;-1) và cắt trục hoành tại điểm có hoành độ bằng 3/2