4道SAT数学选择题练习(一).

　　下面是为大家准备的4道SAT考试数学选择题练习题。同学们在备考SAT数学的过程中，一定要加强习题的练习，熟练到能充分理解题意，争取得到满分。

　　1.If, what is the value of?

　　(A) 6

　　(B) 10

　　(C) 12

　　(D) 30

　　(E) 60

　　2.If is the set of positive integers that are multiples of , and if is the set of positive integers that are multiples of , how many integers are in the intersection of and ?

　　(A) None

　　(B) One

　　(C) Seven

　　(D) Thirteen

　　(E) More than thirteen

　　3.In a community ofpeople, each person owns a dog or a cat or both. If there aredog owners andcat owners, how many of the dog owners own no cat?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　4.A florist buys roses at apiece and sells them for apiece. If there are no other expenses, how many roses must be sold in order to make a profit of ?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　参考答案及解析：

　　1.The correct answer is B

　　Explanation

　　Multiplying both sides of the equationbygives, which simplifies to. Dividing both sides of the equationbygives, and so.　

　　2.The correct answer is E

　　Explanation

　　The intersection of setsandis the set of integers that are inand also in. Setconsists of all positive integers that are multiples of, and setconsists of all positive integers that are multiples of, so the intersection ofandis the set of positive integers that are multiples of bothand. 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 ofand.

　　3.The correct answer is C

　　Explanation

　　To solve this problem, you must realize that some of the dog owners also own cats and some of the

cat owners also own dogs. This has to be true because is more than ! The question asks how many of the dog owners donot own cats. To solve the problem, first find the number of people who own both a dog and a cat. To do this, let equal the number who own both a dog and a cat. Then . (Note: Adding and counts twice, so must be subtracted from the sum to get .) Next, the equation can be solved for , yielding . Finally, the number of dog owners who own no cat is .

　　4.The correct answer is E

　　Explanation

　　Each rose brings a profit of minus , or . The number of roses that need to be sold to make a profit of is . This is roses.

　　以上就是关于4道SAT考试数学选择题练习题及其答案和解析，非常详细。同学们在备考阶段，一定要加强习题的练习以及题意的理解，争取SAT数学满分。

　　下面是为大家准备的4道SAT考试数学选择题练习题。同学们在备考SAT数学的过程中，一定要加强习题的练习，熟练到能充分理解题意，争取得到满分。

　　1.If, what is the value of?

　　(A) 6

　　(B) 10

　　(C) 12

　　(D) 30

　　(E) 60

　　2.If is the set of positive integers that are multiples of , and if is the set of positive integers that are multiples of , how many integers are in the intersection of and ?

　　(A) None

　　(B) One

　　(C) Seven

　　(D) Thirteen

　　(E) More than thirteen

　　3.In a community ofpeople, each person owns a dog or a cat or both. If there aredog owners andcat owners, how many of the dog owners own no cat?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　4.A florist buys roses at apiece and sells them for apiece. If there are no other expenses, how many roses must be sold in order to make a profit of ?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

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