SAT

　　关于SAT数学同学们应该定期进行模拟练习，全面的考题使学生了解所有的题型分布，大量的练习为学生不断提高解题技巧和速度提供了保障。下面我们来看一道美国高考SAT数学题。

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

　　

 

　　Note: Figure not drawn to scale.

　　The circle shown above has center O and a radius of length 5. If the area of the shaded region is 20

  , what is the value of x?

 

　　A. 18

　　B. 36

　　C. 45

　　D. 54

　　E. 72

　　Correct Answer: A

　Correct Answer: A

　　Here's Why:

　　In order to find the value of x, you should first determine the measure of the angle that is located at point O in the right triangle. To determine this angle, you must calculate what fraction of the circle’s area is unshaded. The radius r of the circle is 5 and its area isr2, or 25. The area of the shaded region is 20, so the area of the unshaded region must be 5. Therefore, the fraction of the circle’s area that is unshaded is, or . A circle contains a total of 360 degrees of arc, which means that of 360 degrees, or 72 degrees, is the measure of the angle at point O in the unshaded region. Since you now know that two of the three angles in the triangle measure 72 degrees and 90 degrees and that the sum of the measures of the three angles is always 180 degrees, the third angle must measure 18 degrees. Therefore, x = 18.
 

　　以上就是关于美国高考SAT数学题的详细内容，非常实用。SAT数学的出题方式具有较固定的题型分布，因而识别各类题型和掌握每一题型的解题策略是提高解题能力的关键;针对自己的弱项多做练习是提高解题熟练程度的唯一途径。而这些成功的关键因素正是中国式教育的优势所在，以更加鲜明的特点突出了这一优势。