[計量] 三題數學...我問題真多
23. If the sum of digits of a two digit number xy is 6 more than
the difference between the digit at tenth place and unit digit then
find the value of y?
A.1
B. 2
C. 3
D. 4
E. Cannot be determined
韓網有人算c
26. The area of town A which lies in city B is 20% of the area
of city B not in town A
Col A: Ratio of area of A to that of B
Col B: 18/1
韓網有人寫B
我不太懂這題 因為我怎麼看都覺得B面積大於A
以上兩題我不太知道我想的題意是不是對的
25. Given that the lines k and m pass through point (1, 1).
If the slope of k is less than that of m & if k passes through (0, a)
and m passes through (0, b), then
Col A: a
Col B: b
我寫A 但韓網下面有在討論 我看不太懂
13. Given A= {Set of odd integers less than 100}
B= {Set of even integers less than 5}
C= {Set which include product of both sets A and B}
Col A: number of integers in set C
Col B: 100
這題我之前問過 但是似乎沒人回答得很確定
有人說odd不包括負數 但英文維基百科有寫負
有沒有人可以告訴我這題到底確定答案多少阿
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