[計量] 三題計量
[CBT 2009 07]
1. the number of real roots of the equation
Column A: 2(X^2) + 3/4 = 0
Column B: 2X + 3/4 = 0
ColumnA 無解~
所以答案是 D無法判斷嗎?
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[CBT 2009 07]
2. Half of the toys in a bag are small size,
and a quarter of the toys in the same bag are red toys.
Column A: the ftaction of the toys in the bag
which are both red and small.
Column B: 1/8
答案給 D
自己選 C(相等)
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[CBT 2009 08]
3.The probability that A hits the target is 2/3, and
the probability that B hits the target is 4/7.
What is the probability that either of them hits the target?
答案給 1/7
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4. (還有一題 >__<" 抱歉剛剛沒算到 )
Let n donet the smallest positive integer that is divisible by both
4 and 9, and whose base-10 representation consist of only 4's and 9's,
with at least one of each.
What are the last four digits of n?
(A) 4,444
(B) 4,494
(C) 4,944
(D) 9,444
(E) 9,944
答案給C~
這題很不懂題目的意思，尤其是這句話[whose base-10....4's and 9's]
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5年前
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