【SAT官方每日一题】2012年7月17日（Mathematics > Standard Multiple Choice ）
本帖最后由 滚吧肥汤圆 于 2012-7-18 13:37 编辑考试类型: Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
If http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_1.pngandhttp://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_2.png , and if http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_3.png, which of the following is true?
A. http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_4.png
B. http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_5.png
C. http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_6.png
D. http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_7.png
E. http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_8.png
正确答案:D
解析:
If http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_11.png andhttp://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_12.png , and if http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_13.png, then rewriting http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_14.png as http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_15.pnggiveshttp://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_16.png . It follows that http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_17.png, and so http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_18.png. This last equation is equivalent to http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120717_19.png.
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