美国高考ACT数学题

美国高考ACT数学题

美国高考ACT数学题(1)

关于ACT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。下面我们来看一下美国高考ACT数学题。

1. 3x3·2x2y·4x2y is equivalent to:

A. 9x7y2

B. 9x12y2

C. 24x7y2

D. 24x12y

E. 24x12y2

解析：The correct answer is C. To find an equivalentexpression, you can multiply the constants (3·2·4), combine the x term (x3x2x2→x3+2+2→x7, because when you have a common base you use the base and add the exponents), and combine the y terms (y·y→y1y1→y1+1→y2). The result is 24x7y2.

正确答案选C。常数相乘(3·2·4)，合并x项(x3x2x2→x3+2+2→x7)和y项(y·y→y1y1→y1+1→y2)，结果为24x7y2。

2. Mr. Dietz is a teacher whose salary is $22,570 for this school year, which has 185 days. In Mr. Dietz's school district, substitute teachers are paid $80 per day. If Mr. Dietz'stakes a day off without pay and a substitute teacher is paid to teach Mr.Dietz's classes, how much less does the school district pay in salary by paying a substitute teacher instead of paying Mr. Dietz's for that day?

F. $ 42

G. $ 80

H. $ 97

J. $105