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  3. How many positive whole numbers less than 81 are NOT equal squares of whole numb

How many positive whole numbers less than 81 are NOT equal squares of whole numb

游客2025-02-24  43
问题 How many positive whole numbers less than 81 are NOT equal squares of whole numbers?
选项 A、9
B、70
C、71
D、72
E、73
答案 D
解析 小于81且不等于整数的平方(square)的正整数(positive whole numbers)有多少个?
解：本题的正确答案是(D)。该题也就是问小于81的非完全平方数有多少个。小于81的完全平方数有1，4，9，16，25，36，49，64共8个，而小于81的正整数有80个，所以小于81的非完全平方数有80-8=72个。
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