[計量] 麻煩各位 ^^
How many two-digit positive integers N have the peoperty that the sum of N and
the number obtained by reversing the order of the digits of N is a perfect
square? (A)4 (B)5 (C)6 (D)7 (E)8 Ans:E
Eight light bulbs numbered 1 through 8 are arranged in a circle. The bulbs are
wired so that every third bulb, counting in a clockwise direction, flashes
until all bulbs have flashed once. If the bulb numbered 1 flashes first,
which numbered bulb will flashed last? (A)2 (B)3 (C)4 (D)6 (E)7 Ans:D
If y不等於3 and 3x/y is a prime integer greater than 2, which of the following
must be ture?
I. x=y
II. y=1
III. x and y are prime integers.
Ans: None
In the xy-plane, if the equation of the line K is ax^2 + bx + c =0, which of
the following must be ture?
I. If a is postive, the x-intercept is postive.
II. If b is postive, the slop is postive.
III. If a and b are negative, the slop is negative.
Ans: III only 為什麼I不行@@
比大小
條件: The sum of seven integers is -1.
Column A: The maximum number of the seven integers that can be large than 13
Column B: 6
Ans:C 不知是不是我會錯意,求不出C這答案
A bus trip of 450 miles would have taken 1 hour less if the average speed S of
the trip had been greater by 5 miles per hour.
Column A: The average speed S, in miles per hour, for the trip
Column B: 50
Ans: B 題目給的條件似乎怪怪的?
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