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SAT 备考经验 SAT官方每日一题2011.6.12

SAT官方每日一题2011.6.12

信息来源：网络发布时间:2011-06-14

2011年6月12日

考试类型:Mathematics > Standard Multiple Choice

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

If square root (x minus a) = square root (x + b) , which of the following must be true?

A. a = 0

B. b = 0

C. a + b = 0

D. a minus b = 0

E. (a^2) + (b^2) = 0

正确答案:C

解析:

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

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SAT官方每日一题2011.6.12

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