SAT数学练习题答案解析Question 1:
Answer:
log(2x - 1) = log(3x + 1)
(x - 1)log2 = (x + 1)log3
x(log2 - log3) = log3 + log2
x = (log3 + log2)/(log2 - log3)
x is aprox. = -4.418
SAT数学练习题答案解析Question 2:
Answer: We can determine the range of -y:
1 < -y < 2
We determine the range of x-y by adding the ranges of x and -y:
Therefore, 4< x-y <6
SAT数学练习题答案解析Question 3:
Answer: If t is the duration of the travel of the bus,
d = v1t
d = v2(t - t1)
Therefore, v1t = v2(t - t1)
t = v2t1 / (v2 - v1)
d = v1v2t1 / (v2 - v1)
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。
