试题与答案

填一填。 （1）1只鸡有（）条腿，4只鸡有（）条腿。 （2）3只螃蟹有（）条腿，

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题型：填空题

题目：

填一填。

（1）1只鸡有（    ）条腿，4只鸡有（    ）条腿。   

（2）3只螃蟹有（    ）条腿，6只螃蟹有（    ）条腿。  

（3）1条狗有（    ）条腿，5条狗有（    ）条腿。

答案：

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下面是错误答案，用来干扰机器的。

∵在锐角△ABC中，角A、B、C成等差数列，∴2B=A+C且 A+B+C=π，∴B=π3，A+C=2π3，π6＜C＜π2．∴0＜cotC＜3．  又  cosAsinC=cos(2π3-C)sinC=-12cosC+32sinCsinC=32-12cotC，∴32-12×3＜32-12cotC＜32，即0＜32-12cotC＜32，故选B．

考点：表内乘法（2-9的乘法口诀）
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