SAT数学练习题答案解析Question 1:
Answer: As x gets infinitely larger,
lim[(2x + 5)/(4x-7)] = lim[(2 + 5/x) / (4 - 7/x)] = (2 + 0) / (4 - 0) = 2/4 = 1/2
SAT数学练习题答案解析Question 2:
Answer: OAB equilateral means the AOB angle is 60o
The ratio between the AOB angle and 360o is equal to the ratio between the length of the arc AB and the circumference of the circle
60o/360o = arcAB / (2 ? · 9)
arcAB = 3 · ?
SAT数学练习题答案解析Question 3:
Answer: The area of triangle ABD is equal to (1/2)AB·DE, where DE is the altitude from D to AB.
AreaABD = (1/2)4·3 = 6.
要想SAT2数学成绩有所提高，坚持每天做练习是十分必要的，就像这样每天完成SAT2数学Level 2练习题，并进行总结，日积月累，成绩就会有明显地提高。
