第1題
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?
2,4,5,6,9
ans:9
第2題
n=(28)^3
column a
the units digit of n
column b
4
為什麼答案是the quantity of column b is greater
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01/15 14:11, , 1F
01/15 14:11, 1F
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