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hoanganh06112002
2 năm trước
Bài 2. a) Tích các số tự nhiên từ 6 đến 30 tận cùng bằng chữ số gì? b) Tích các số tự nhiên từ 7 đến 22 tận cùng bằng mấy chữ số 0? Bài 3. a) Cho a, be N. Chứng tỏ rằng ab (a + b) : 2 b) Tìm x, y e N, biết rằng : xy (x + y) = 20 112 009 c) Tìm m, n e N biết rằng (3m + 2n) (7m + 3n) - 7 = 20•11• 2008. Bài 4 . a) Từ 1 đến 1000 có bao nhiêu số chia hết cho 2? bao nhiêu số chia hết cho 5? b) Từ 50 đến 2009 có bao nhiêu số chia hết cho 2? bao nhiêu số chia hết cho 5? Bài 5. Cho M = 1 + 3 +3 +3 + ... + Tìm số dư khi chia M cho 13, chia M cho 40. 3100
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