SAT官方每日一题 6月12日

　　SAT试题类型 Mathematics Standard Multiple Choice

　　Read the following SAT test question and then click on a button to select your answer.

　　If square root = square root , which of the following must be true?

　　Answer Choices

　　a = 0

　　b = 0

　　a + b = 0

　　a minus b = 0

　　+ = 0

　　答案:B

　　解析:

　　Explanation

　　Squaring both sides of the equation square root = square root gives the equation x minus a = x + b. Subtracting x from both sides now gives negative a = b, or a + b = 0