sat1两道简单数学题看不懂(囧),求解(即题是啥意思)
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sat1两道简单数学题看不懂(囧),求解(即题是啥意思)
第一个:
When a certain odd number is divided by 5,the remainder is 1.Which digit must be in the units place of this odd number?
A 1 B 3 C 5 D 7 E 9
啥叫units place啊?
第二道:
Let a "prd" number be defined as one in which the product of the positive divisors of the number,not including the number itself,is greater than the number.Which of the following is a "prd" number?
A 8 B 15 C 18 D 21 E 27
这道题更看不懂了,正除数的积大于本身?
谢谢回答者的回答~
第一个:
When a certain odd number is divided by 5,the remainder is 1.Which digit must be in the units place of this odd number?
A 1 B 3 C 5 D 7 E 9
啥叫units place啊?
第二道:
Let a "prd" number be defined as one in which the product of the positive divisors of the number,not including the number itself,is greater than the number.Which of the following is a "prd" number?
A 8 B 15 C 18 D 21 E 27
这道题更看不懂了,正除数的积大于本身?
谢谢回答者的回答~
![sat1两道简单数学题看不懂(囧),求解(即题是啥意思)](/uploads/image/z/3513969-9-9.jpg?t=sat1%E4%B8%A4%E9%81%93%E7%AE%80%E5%8D%95%E6%95%B0%E5%AD%A6%E9%A2%98%E7%9C%8B%E4%B8%8D%E6%87%82%EF%BC%88%E5%9B%A7%EF%BC%89%2C%E6%B1%82%E8%A7%A3%EF%BC%88%E5%8D%B3%E9%A2%98%E6%98%AF%E5%95%A5%E6%84%8F%E6%80%9D%EF%BC%89)
第1题是说,某个奇数被5除,余数是1.问该数的个位数是几.units place就是个位.答案是A.
第2题是说,将“prd数”定义为这样一种数,它的正因数(不含它本身)的积大于它自身.问以下哪个是prd数?答案是C,因为18的正因数有2,3,6,9,其积大于18.
第2题是说,将“prd数”定义为这样一种数,它的正因数(不含它本身)的积大于它自身.问以下哪个是prd数?答案是C,因为18的正因数有2,3,6,9,其积大于18.