標題範例:Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
The sum, product, and average (arithmetic mean) of three integers are equal. If two of the integers are 0 and -5, the third integer is
(A) -5
(B) 0
(C) 2
(D) 5
(E) 10
謎底:D
【剖析】
You have three integers, 0,-5, and x, whose sum, product, and average are equal. Since 0 is one of the numbers, the product is 0. So the sum and average are also equal to 0. Therefore,-5+x+0=0 , and x=5.