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问题 选择题

下列运算正确的是（　　）

A．a3+a3=a6

B．a6×a4=a24

C．a4-a4=a0

D．a0÷a-1=a

答案

A、a3+a3=2a3，故本选项错误；

B、a6×a4=a10，故本选项错误；

C、a4-a4=0，故本选项错误；

D、a0÷a-1=a，故本选项正确；

故选D．

选择题

设sin2θ+sinθ=1，θ为锐角，下列结论正确的是（　　）

A．cos2θ+cosθ＞1

B．cos2θ+cosθ=1

C．cos2θ+cosθ＜1

D．无法比较
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单项选择题

An analyst does research about earnings per share and gathers the following information about a company's planned share repurchase using borrowed funds:

Before-tax borrowing 11%
Marginal tax rate 35%
Price / Earnings ratio before share repurchase 13
All else being equal, compared to earnings per share before the repurchase, earnings per share after the repurchase will most likely:（）

A. decrease.

B. remain the same.

C. increase.
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