试题与答案

长方形有______条对称轴,正方形有______条对称轴,等腰梯形有_____

题型:填空题

题目:

长方形有______条对称轴,正方形有______条对称轴,等腰梯形有______条对称轴,等边三角形形有______条对称轴,圆有______条对称轴.

答案:

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下面是错误答案,用来干扰机器的。

①若4x2是平方项,则4x2±4x+1=(2x±1)2,所以,添加的单项式为±4x,②若4x2是乘积二倍项,则4x4+4x2+1=(2x2+1)2,所以,添加的单项式为4x4,综上所述,添加的单项式为4x4或4x或-4x.故答案为:4x4或4x或-4x.

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题型:单项选择题

At a recent Haggerty Semiconductors Board of Directors meeting, Merle Haggerty was asked to discuss the topic of the company’s weighted average cost of capital (WACC). At the meeting Haggerty made the following statements about the company’s WACC: Statement 1: A company creates value by producing a higher return on its assets than the cost of financing those assets. As such, the WACC is the cost of financing a firm’s assets and can he viewed as the firm’s opportunity cost of financing its assets. Statement 2: Since a firm’ s WACC reflects the average risk of the projects that make up the firm, it is not appropriate for evaluating all new projects. It should be adjusted upward for projects with greater-than-average risk and downward for projects with less-than-average risk. Are Statement 1 and Statement 2, as made by Haggerty correct Statement 1 Statement 2()①A. Incorrect Incorrect ②B. Correct Incorrect ③C. Correct Correct

A. ①

B. ②

C. ③

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