[計量] If S is a set of all 2-digit ...
1.
If S is a set of all 2-digit integers that consist of multiples of 3
or multiples of 5, then what is the value of the range in set S ??
A)77
B)81
C)87
D)89
E)91
ANS:D
他問的是啥意思??
是求範圍嗎??
2.
If three line segments AB, CD, and EF intersect each other at point O,
then how many sets of "vertical angles" are there?
A)2
B)4
C)5
D)6
E)8
ANS: D
這題有圖...
它是三條線相交於一點...
可我怎麼算...也只有2個直角...
請問我是哪裡弄錯了??????
請熱心的版友解答疑惑>"<
感激不盡...
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