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SAT官方每日一題 2017年6月12日.

2017/08/05 13:58:16 編輯： 瀏覽次數(shù)：334 移動(dòng)端

SAT試題類型 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? Answer Choices (A) a = 0 (B) b = 0 (C) a + b = 0 (D) a minus b = 0 (E) (a^2) + (b^2) = 0 答案:B 解析: Explanation Squaring both sides of the equation square root (x minus a) = square root (x + b) gives the equation x minus a = x + b. Subtracting x from both sides now gives negative a = b, or a + b = 0

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