SAT数学练习题答案解析Question 7:
Answer three should be the one that is not true, and we can verify this result with an example: an isosceles triangle with a = 3, c = 3, b= 10 will satisfy the inequality.
SAT数学练习题答案解析Question 8:
Answer:
(1 - sin2x)/cos(x) + (1 - cos2x)/sin(x) = cos2x/cos(x) +
sin2x/sin(x) = sin(x) + cos(x).
SAT数学练习题答案解析Question 9:
Answer: From the first equation, x = t + 3, t = x - 3.
We substitute t in the second equation: y = t + 9 = x - 3 + 9 = x + 6
We compare y = x + 6 with the equation of any line: y = mx + n, where m is the slope and n the offset and the slope of y = x + 6 is 1.
SAT数学练习题答案解析Question 10:
Answer: The easiest way to solve this problem is to check the results of the 5 answers for x = 0:
(a) y = 5· 1.20 - 2 = 3
(b) y = 4· 1.20 = 4
(c) y = 5· 1.30 = 5
(d) y = 5· 1.20 - 1 = 4
(e) y = 5· 1.30 + 1 = 6
and (c) must be the correct answer. We can verify at this point the results of y = 5· 1.3x for x = -5, x = 3 and x = 7
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。
