思考题解答：
国王与国际象棋冠军下棋,
263~922亿亿粒, 1斤米 =2万粒, 约为 461万亿斤,
20+21+? +263~1844亿亿粒
28 = 256
216 = 256?256 = 65536
232 = 65536?65536 = 4294967296
264 = 4294967296?4294967296
= 18,446,744,073,709,551,616
谁丢了眼镜，请来认领
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password,nisplus
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习题 2 4-1,5-4（第 5周交）
习题 3 4-3,4-5,5-2(a),5-7
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