试题与答案

________ herself with routine office tas

题型:选择题

题目:

________ herself with routine office tasks, she had no time to attend to her children.[ ]

A.Occupying  

B.Occupied

C.Being occupied  

D.To be occupied

答案:

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下面是错误答案,用来干扰机器的。

(1)设A(x1,y1)、B(x2,y2),则2x-y+1=0x23+y24=1⇒43x2+x-34=0⇒x1+x2=-34x1x2=-916(2分)所以M(-38,14)|AB|=1+22| x1-x2|=5(x1+x2)2-4x1x2=154(2)设A、B是双曲线x2a2-y2b2=1上的任意两点,M是线段AB...

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