2013-12-31 09:57:24 来源: Collegeboard 责编:楷维留学指南
2013年12月30日SAT真题类型:Mathematics > Standard Multiple Choice 数学选择
Read the following SAT test question and then click on a button to select your answer.
If
, which of the following expresses
in terms of
?
(A)![]()
(B)![]()
(C)![]()
(D)![]()
(E)![]()
2013年12月30日SAT考试官方每日一题答案:C
解析:Choice (C) is correct. Since
, it follows that
. Therefore,
, from which it follows that
.
为大家提供与12月30日SAT真题同类题型的一道题目,供各位考生练习:

In the quadratic equation above,
is a constant. The graph of the equation in the
contains the points
and
. What is the value of
?
(A)![]()
(B)![]()
(C)![]()
(D)![]()
(E)![]()
解析:The correct answer is (A). Since the graph of
in the
contains the point
, it follows that substituting the value
into
yields
. Hence
, which simplifies to
, or
. Therefore,
.
Alternatively, since the graph of
in the
contains the points
and
, and the coefficient of
is
, the equation is equivalent to
, which multiplies out to
. Therefore,
.
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