中国农业银行
单选题小明有小人书若干本,小芳借走一半加1本;小容又借走剩下的书的一半加2本;再剩下的书,小军借走一半加3本,最后小明还有2本书。小明原有( )本小人书。
A.45
B.50
C.57
D.63
参考答案:B进入在线模考
【答案】B。解析:直接计算比较繁琐,所以本题可采用逆推法。
| 步骤 | 本数 |
| 最终状态 | 小明还有2本 |
| 小军借之前 | (3+2)x2=10本 |
| 小容借之前 | (10+2)x2=24本 |
| 小芳借之前(原始状态)。 | (24+1)x2=50本 |
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