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美国⾼考ACT数学真题及答案解析
ACT数学考试是很多同学选择去美国留学的⼊学考试，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。希望能够帮助⼤家。
什么护肤品好1. A rectangular lot that measures 150 ft by 200 ft is completely fenced. What is the approximate length, in feet, of the fence?
F. 300
G. 350
H. 400
并肩而行J. 700
K. 1,400
解析：The correct answer is J. To find the length of fence needed to fence a rectangular lot 150 ft by 2
00 ft, you need to find the perimeter. The formula for the perimeter of a rectangle is 2 times the sum of the length and width, or P = 2( l+ w). 2(150 +200) =2(350) =700.
正确答案选J。所需篱笆的长度即为这块长150英尺宽200英尺矩形⼟地的周长。根据矩形周长公式，可知：矩形周长=2(长+宽)，即2(150 +200) =2(350) =700英尺。
2. So far, a student has earned the following scores on four 100-point tests this grading period:65,73,81, and 82. What score must the student earn on the fifth and last 100-point test of the grading period to earn an average test grade of 80 for the 5 tests?
A. 75
B. 76
C. 78
D. 99
E. The student cannot earn an average of 80.
解析：The correct answer is D. To find what the student needs to score on the fifth 100-point test to average a score of 80, you need to find the point total for the student so far by adding 65,73, 81 and 82. That sum is 301. Averaging 80 points on 5 tests means the student must earn 400 points (80·5). The acore needed on the last test is the difference,400～301, or 99.
正确答案选D。该学⽣前四次共得301分;5次考试平均分为80，意味着5次考试总分需达到400分，那么该学⽣最后⼀次考试需要达到的分数为400与301的差，即99分。
3. Mr. Dietz is a teacher who 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's takes a day off without pay and a substitute teacher is paid to teach Mr. Dietz's class, 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
K. $122
猪肉三鲜馅解析：The correct answer is F. To find Mr. Dietz's pay per day, you can divide his salary, $22,570, by the number of days he works,185. His pay per day is 22570/185, or $122. When Mr. Dietz takes a day off without pay and the school pays a subsititute $80, the school district saves the difference in the amounts, 122-80, or $42.
正确答案选F。先算出Dietz先⽣每天的平均⼯资，⽤22570除以185(可⽤计算器)，即122美元。再⽤122美元减去学校需要⽀付临时⽼师的费⽤80美元，即可算出学校结余的费⽤，为42美元。
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4. 3x3·2x2y·4x2y is equivalent to:
A. 9x7y2
B. 9x12y2
C. 24x7y2
怎么恢复手机通讯录联系人边城摘抄D. 24x12y
E. 24x12y2
解析：The correct answer is C. To find an equivalent expression, you can multiply the constants (3·2·4), combine the x term (x3x2x2 → x3+2+2 → x7, becau when you have a common ba you u the ba 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。
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以上就是⼩编为⼤家带来的关于ACT数学真题及答案解析，希望能够帮助⼤家，在备考中⼀定要多加练习。
