课程咨询
美国本科留学资料领取

扫码添加助教

免费领取

备考资料大礼包

扫码关注公众号

SAT模拟考试题:SAT数学练习题(20)

2016-08-11 17:03:53来源:网络

  参考答案与解析

  Question 1: How many integers between 1 and 50 contain the digit 3?

  Answer: 14

  Explanation: There are 14 integers between 1 and 50 that contain

  the digit 3: 3, 13, 23, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 43.

  Question 2: |2x + 1| = 3 |x + 5| = 6

  What value of x satisfies both of the equations above?

  Answer: 1

  Explanation: Since |2x + 1| = 3, the value of 2x + 1 is either 3 or -3.

  2x + 1 = 3

  2x = 2

  x = 1

  2x + 1 = -3

  2x = -4

  x = -2

  The two values of x that satisfy the first equation are 1 and -2.

  Since |x + 5| = 6, the value of x + 5 is either 6 or -6.

  x + 5 = 6

  x = 1

  x + 1 = -6

  x = -7

  The two values of x that satisfy the second equation are 1 and -6.

  You are asked to find the value of x that satisfies both equations and that value is 1.

  Question 3: The length of rectangle B is 50% longer than the length of rectangle A and

  the width of rectangle B is 50% shorter than the width of rectangle A. What is the ratio

  between the area of rectangle B and the area of rectangle A?

  Answer: .75

  Explanation: The area of rectangle A is AreaA = lA·wA

  The area of rectangle B is AreaB = lB·wB = 1.5·lA·.5·wA = .75·lA·wA

  The ratio between the area of rectangle B and the area of rectangle A is:

  AreaB/AreaA = (.75·lA·wA)/(lA·wA) = .75

  Question 4: If a§b = ab + ba for all real numbers a,b, what is (2§3)§1?

  Answer: 18

  Explanation: 2§3 = 23 + 32 = 8 + 9 = 17

  17§1 = 171 + 117 = 17 + 1 = 18

  In conclusion, (2§3)§1 = 18

  Question 5: What is the value of the x + y sum, if x + 2y = 5 and 2x + y = 7 ?

  Answer: 4

  Explanation: The easiest way to find x + y is to realize that by adding

  the 2 equations, the left term of the addition is a multiple of x + y:

  3(x + y) = 12

  x + y = 4

  You can also solve the system of 2 equations, find x and y and add them,

  but this will likely take longer.

SAT水平能力测试【0元免费测试】

本文关键字: SAT模拟考试 SAT数学

美本留学资料大礼包

微信扫描二维码 回复【美本资料】

机考SATCB官方样题|可汗练习题|AP全科大纲/备考资料包

更多资料
更多>>
更多内容

添加美本助教号

自动领取备考资料大礼包

1. 打开手机微信【扫一扫】,识别上方二维码;
2.添加【美本助教】,自动领取留学备考资料大礼包。

可汗学院新SAT题目完整版

微信扫描下方二维码 即可获取

SAT1500分录播课(旗舰版+1对1) 托福精讲录播课(旗舰版) 托福8-10人直播VIP小班
更多>>
更多公开课>>

2024美本留学资料免费领取

微信添加美本助教

新东方美本助教
更多>>
更多资料

添加新东方在线美本助教号

自动领取备考资料大礼包

1. 打开手机微信【扫一扫】,识别上方二维码;
2.添加【Ella助教】,自动领取留学备考资料大礼包。