分享五道精选ACT数学考试题
ACT考试由美国大学测验组织机构ACT主办。ACT考试均不是单纯的语言考试,而是对学生综合能力的测试。考试重视学生对基础课程的掌握并检查学生一般学术能力,难度贴近高中生。必考科学为四个部分:英语、数学、阅读、科学,全部为选择题,共215道。总分36分,考试时间共175分钟。
ACT考试不分I和II。它包括四个部分:数学、英语、阅读、科学推理。这里值得一提的是科学推理,这部分整合高中、初中物理,化学,生物,语文,英语口语,笔试等学科,综合在一张卷子上,以推理题目的形式出现。出题方式比较灵活,考验对高中知识的掌握和逻辑能力。「ACT Plus Writing」则为上述四个科目外再加上一个30分钟的作文测试。所有美国4年制学院及大学均接纳ACT的成绩。正因为ACT是一个以课程为本的考试,许多要求SAT Subject Tests成绩的大学,都会完全或部份豁免ACT考生有关的要求。
ACT考试全称“American College Testing”,中文名称为“美国大学入学考试”,是美国大学本科的入学条件之一,也是奖学金发放的重要依据之一。由ACT公司主办。ACT考试分为四个部分:文章改错(English),数学(Math),阅读(Reading),和科学推理(Science Reasoning)。另外,作文为选考。
ACT(American College Test)考试与SAT考试均被称为“美国高考”,它们既是美国大学的入学条件之一,又是大学发放奖学金的主要依据之一及对学生综合能力的测试标准。这个考试也被所有美国四年制大学承认,与SAT相比学校没有偏向性,两个考试的成绩均接受。和SAT不同,ACT考试更像一种学科考试,它更强调考生对课程知识的掌握,同时也考虑到了对考生独立思考和判断能力的。从时间上看,ACT考试比SAT紧张;从难度上看,ACT考试比SAT更容易一些,尤其对中国的考生来说,选择ACT考试可能更容易在短期内获得相对满意的成绩!
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。

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 equivalent expression, 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's takes 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
K. $122
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 these 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。
3. 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。
4. 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
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 200 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。
5. The expression a[b+(c-d)] is equivalent to:
A. ab + ac - ad
B. ab + ac + ad
C. ab + ac - d
D. ab + c + d
E. ab + c - d
解析:The correct answer is A. To find an equivalent expression, multiply a by b+c-d. This results in a(b) + a(c) + a(-d), or ab + ac - ad.
正确答案选A。根据乘法分配率展开括号可得ab + ac - ad。
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