標題範例:Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
If (x+y)²=x²+y², which of the following statements must also be true?
I.x=0
II.(x-y)²=x²+y²
III.xy=0
(A) None
(B)I only
(C)II only
(D)III only
(E)II and III
謎底:E
【剖析】