在GRE数学考试中,一般都假定以下信息为真:
All numbers used are real numbers;
All figures lie on a plane unless otherwise indicated;
All angle measures are positive;
All lines shown as straight are straight. On the computer-based test, lines that appearjagged can also be assumed to be straight :
Figures are intended to provide useful information for answering the questions. However,except where a figure is accompanied by aNote stating that the figure is drawn tO scale, solve the problem using your knowledge of mathematics, not by visual measurement or estimation.
细心的读者会发现,上述假设实际上就是ETS 出题原则,即:
所有的数都是实数;
除非题目中专门指出假设所有图形都在同一个平面内
;
所有的角的测量值都是正数;
所有显示为直线的线均可当作直线来处理;
伴随问题的图形将为解题提供有用的信息。但是,只有在问题中指出本图形是按比例画出时,才可以用目测或估计而得到的信息去解题。否则,只能运用你的数学知识去回答问题。这一解题原则可以简称为只能读图,不能度量的原则。
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