完比赛后,口渴难耐,去小店买饮料,饮料店搞促销,凭三个空瓶可以再换一瓶,他们最少买多少瓶饮料才能保证一人一瓶?答:19瓶(18空瓶换6瓶;6空瓶换2瓶;19+6+2=27)
6.在一个平面上画1999条直线最多能将这一平面划分成多少个部分?答:1999001(1当k1时,fk2个区域2当k
时,有f
个区域则当k
1时,有f
1个区域,这条直线与以前所有的直线相交且不经过以前的任何交点,多出来
1个区域,f
1f
)
阅读回答
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