sat2数学真题练习精选

　　sat2数学真题练习精选!在SAT数学备考冲刺阶段，很多考想要找一些数学题做练习，下面小编为大家汇总整理了SAT2数学真题精选练习，大家可以在做的过程中了解SAT2数学考题的难度，另外还可以总结答题知识点，点击下载全套真题。

　　Question #1:

　　Which of the following equations best models the data in the table above?

　　(a) y = 5· 1.2x - 2

　　(b) y = 4· 1.2x

　　(c) y = 5· 1.3x

　　(d) y = 5· 1.2x - 1

　　(e) y = 5· 1.3x 1

　　Answer: The easiest way to solve this problem is to check the results of the 5 answers for x = 0:

　　(a) y = 5· 1.20 - 2 = 3

　　(b) y = 4· 1.20 = 4

　　(c) y = 5· 1.30 = 5

　　(d) y = 5· 1.20 - 1 = 4

　　(e) y = 5· 1.30 + 1 = 6

　　and (c) must be the correct answer. We can verify at this point the results of y = 5· 1.3x for x = -5, x = 3 and x = 7

　　Question #2:

　　If a, b and c are the sides of any triangle, which of the following inequalities is not true?

　　(a) a·b > 0

　　(b) a + b > c

　　(c) a + c/2 >b

　　(d) b + c > a

　　(e) (a + b)·(b + c) > a·c

　　Answer: The first answer is true, since the product of 2 positive reals will be positive.

　　The second and the fourth answers will also be true, since the sum of 2 sides of a triangle is always higher than the third side.

　　The fifth answers is also true because it is just a multiplication of the second and fourth inequalities of positive terms.

　　Answer three should be the one that is not true, and we can verify this result with an example: an isosceles triangle with a = 3, c = 3, b= 10 will satisfy the inequality.

　　Question #3: In the figure below, quadrilateral ABCD has AB parallel with CD. What is the area of triangle ABD?

　　(a) 3

　　(b) 4

　　(c) 6

　　(d) 8

　　(e) 9

　　Answer: The area of triangle ABD is equal to (1/2)AB·DE, where DE is the altitude from D to AB.

　　以上是小编为大家带来的sat2数学真题练习精选内容，大家可以做一下练习然后核对答案解析，可以为我们提供一些答题思路。