两道SAT数学练习题(附答案).

　　SAT数学考试虽然简单，我们也不能够轻视。下面小编为大家整理了两道SAT数学练习题，包括答案，希望能够帮助大家更好地备考SAT数学考试。

　　1、If is divisible by , , and , which of the following is also divisible by these numbers?

　　Answer Choices

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　The correct answer is D

　　Explanation

　　Since is divisible by , , and , must be a multiple of , as is the least common multiple of , , and . Some multiples of are , , , , and .

　　If you add two multiples of , the sum will also be a multiple of . For example, and are multiples of and their sum, , is also a multiple of .

　　If you add a multiple of to a number that is not a multiple of , the sum will not be a multiple of . For example, is a multiple of and is not. Their sum, , is not a multiple of .

　　The question asks which answer choice is divisible by , , and ; that is, which answer choice is a multiple of . All the answer choices are in the form of "plus a number." Only choice (D), , has added to a multiple of . The sum of and is also a multiple of , so the correct answer is choice (D).

　　2、Ifis the set of positive integers that are multiples of, and ifis the set of positive integers that are multiples of, how many integers are in the intersection ofand?

　　Answer Choices

　　(A) None

　　(B) One

　　(C) Seven

　　(D) Thirteen

　　(E) More than thirteen

　　The correct answer is E

　　Explanation

　　The intersection of sets and is the set of integers that are in and also in . Set consists of all positive integers that are multiples of , and set consists of all positive integers that are multiples of , so the intersection of and is the set of positive integers that are multiples of both and . This is the set of all positive integers that are multiples of . There are an infinite number of positive integers that are multiples of , so there are more than thirteen integers in the intersection of and .

　　以上便是澳际小编为大家整理的两道SAT数学练习题以及答案的相关介绍，希望对大家有所帮助。更多SAT考试相关资料尽在澳际教育网SAT考试频道，澳际小编祝大家都能取得理想的SAT数学考试成绩!