SAT官方每日一题 2011年3月23日 SAT题型:Mathematics > Standard Multiple Choice Read the following SAT test question and then click on a button to select your answer. First, 3 is subtracted from x and the square root of the difference is taken. Then, 5 is added to the result, giving a final result of 9. What is the value of x? Answer Choices (A) 3 (B) 4 (C) 5 (D) 16 (E) 19 答案: 解析: Explanation When 3 is subtracted from x, the result is x minus 3. The square root of this difference is square root (x minus 3). When 5 is added to square root (x minus 3), the final result is 9. This can be written as square root (x minus 3) + 5 + 9. Subtracting 5 from both sides gives the equation square root (x minus 3) = 4. Squaring both sides of this equation gives x minus 3 = 16, or x = 19.

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