Re: [問題]來欣數學Q部分
Q2
20. 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 Ans:E
我用刪去法 刪去4和6 因為如果ㄧ定可以被4或6整除 代表2也一定可以整除
剩下的... 我就不會了 請板上大大提供解法>"<
Q21
21. The scale drawing of a certain room is a rectangle 5 inches by 6 inches. If
the drawing has the scale 1/4 inch to 1 foot, which of the following will
give the actual number of square feet of the room?
A.15/8 B.15/2 C.90 D.120 E.480 Ans:E
我看不懂題目的意思>"<
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