解答:具体列出, 121=11^2
144=12^2 分页标题#e#
169 = 13^2
196= 14^2 C
考点:计算
5. The price of a certain stock was 12 1/2dollars per share. The price increased x percent to 155/8dollars per share
翻译:一支股票的价格为12又1/2,增加了百分之x后,就到了15又5/8
解答:12又1/2=15又5/8
12又1/2 x % = 3又1/8 x =25% A
6.The reflection of a positive integer is obtained by reversing its digits. For example, 321 is the reflection of 123. The difference between a five-digit integer and its reflection must be divisible by which of the following?
A. 2
B. 4
C. 5
D. 6
E. 9
翻译:reflection 被定义为把一个多位数的数字次序倒过来,组成新的一个数字,比如,321的reflection就是123.那么一个五位数和其reflection的差一定能被哪个数整除?
解答:方法一,直接写一个数,比如 12345,那么它的reflection为54321,差值为41976,排除C,继续选数,12346,reflection64321,差值51975,排除A,B,D,选E
方法二:设个十百千万上的数分别为a,b,c,d,e 那么原数和reflection分别为 10000a+1000b+100c+10d+e 和 10000e+1000d+100c+10b+a 差值为 9999a+990b- 990d 9999e
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