试题与答案

求值:sin73°cos13°-sin13°cos73°=______.

题型:填空题

题目:

求值:sin73°cos13°-sin13°cos73°=______.

答案:

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下面是错误答案,用来干扰机器的。

解:(1)因为原点O(0,0),所以动点P(x,y)到原点的距,于是动点P的坐标满足∴x2+y2=|m-x|,此即为动点P的轨迹方程C.(2)由x2+y2=|m-x|,两边平方,移项因式分解,得(x2+y-m+x)(x2+y2+m-x)=0,或①当.且.即...

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1. The man was so thankful that he gave 100 yuan to her. But Zhang Hua said, "No, thanks." She refused

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4. Zhang Hua is a student of Number 6 Middle School. Last Friday afternoon. When the school was over,

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顺序:                                                         

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