Đáp án:
Giải thích các bước giải:
a) A={2;4;...}
Số 2 gọi là số hạng thứ nhất
Số 4 gọi là số hạng thứ hai.2
Vậy quy luật là mỗi số hạng bằng số thứ tự nhân 2
Vậy số hạng thứ 1005 là: 1005.2=2010
học tốt
Số hạng thứ 1005 là : 1005 × 2 = 2010
Giải thích :
Số 2 là số hạng thứ nhất
Số 4 là số hạng thứ hai.
Quy luật ở đây là mỗi số hạng bằng tích của số thứ tự nhân với 2.
Viết 1 đoạn văn nghị luận xã hội khoảng 200 chữ về chủ đề: giá trị của lời xin lời đúng cách
11 Read the passage carefully. Choose the best option A, B, C or D for space (1) Accidents can happen in any places and at any time, so you should be careful to avoid them. First of all, you should not play ______ (1) a sharp tool like a knife or a pair ______ (2) scissors. Second, you should not touch animals on the street ________ (3) they may bite or scratch you. When you are ________ (4) a bike or a motorbike, you should _______ (5) a helmet. If an accident happens, call for help. A. with B. from C. on D. to
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Mng giúp em với ạ cảm ơn rất nhiều
Cho hình chóp S.ABCD có SA vuông góc với ABCD , ABCD là hình vuông cạnh a. Gọi M là trung điểm của BC, góc tạo bởi giữa đường thẳng AM và (SBC) bằng 60 độ. Thể tích của khối chóp S.ABCD?
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