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trinhmzon
2 năm trước
bài 1. cho A= 1+2+2 mũ 2+2 mũ 3 +.........+2 mũ 11 không tính tổng A, hãy chứng tỏ A chia hết cho 3 bài 2. chứng tỏ rằng với mọi số tự nhiên n thì tích (n+3)(n+12) là số chia hết cho 2 bài 3. chứng minh rằng: ab+ba chia hết cho 11 bài 4. chứng tỏ: A=3 mũ 1+ 3 mũ 2+3 mũ 3+...........+3 mũ 60 chia hết cho 13 bài 5. tính S= 4+7+10+13+................+ 2014 b. chứng minh rằng n.(n+2013) chia hết cho 2 với mọi số tự nhiên n c. cho m= 2+2 mũ 2+2 mũ 3+...+2 mũ 100 chứng tỏ m chia hết 5
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