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13年的千金大小姐生活后
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第77章 不得了(第1页)

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林姑娘的事情还得她自己去和家里谈,他们的家庭内部会议苏雅妍是没办法帮上忙的,大小姐今天得对付魏主任。

打开办公室的门,老魏正给他侄子开小灶呢,见来人是苏雅妍,魏主任笑着点了点头,指着旁边的座位说道:“你先自己看会书,我给魏然再讲两题。”

苏雅妍点点头,把书包放到桌子旁边,将模拟试题和参考书拿了出来,把桌面铺满,安安静静的看了起来。

魏主任此刻的表情很严肃,似乎对魏然的解答并不是太满意。

“你看这题,其实和刚才做的题型是一样的,虽然条件变了,但是也大同小异,你就是没转过弯来,对了,苏雅妍,这题你来做,魏然你在旁边看。”

我这边屁股还没捂热乎呢……

不过既然点名了,大小姐也只能凑了过去:“什么题目呀?”

魏然下意识往旁边躲了躲,紧张的捏着手里的笔,从女孩身上散出的一阵阵体香不断的刺激着他的嗅觉,女孩的侧脸特别的美,轮廓分明勾勒出完美的弧度,睫毛随着一眨一眨的眼睛俏皮的扑扇着,水润的红唇微微张开,如同伊甸园的苹果深深吸引着他,鼓胀的胸脯直接压在了桌子上,摄人心魄。

“好好听着,不要呆。”

魏主任的声音将他拽回到现实里,总算意识到自己有多不礼貌,不过还好似乎对方没有现自己的冒犯,他急忙把视线转移到题目上,等待着苏雅妍的解答。

“设正整数n大于1,它的全部正因数为d1,d2,…,dk,满足1=d1<d2<…<dk=n。再设d=d1d2+d2d3+…+dk-1dk…………”

女孩将题目念出,清脆悦耳的声音灌进魏然的双耳,他目光渐渐呆滞,又失神了。

苏雅妍撇了一眼魏然,有些怀疑,不过这家伙低着头,也不知道他有没有解题思路。

“若d1,d2,…,dk是n的全部正因数,则nd1,nd2,…,ndk也是n的全部正因数,且当1=d1<d2<…<dk=n时,有dj=ndk-j+1。则

n2d2=n2(d1d2)≤d=d1d2+d2d3+…+dk-1dk=n2{1(dk-1dk)+1(dk-2dk-1)+…+1(d1d2)}

≤n2{(1dk-1-1dk)+(1dk-2-1dk-1)+…+(1d1-1d2)}

=n2(1d1-1dk)=n2(1-1n)=n2-n。”

洋洋洒洒的将解答过程写在纸上,丝毫不见停顿,魏主任一边看一边点头,这姑娘思路清晰,直指要害,毫不拖泥带水,不得不赞叹确实是个好苗子。

“……n的全部正因数是1和n本身,即n是素数。”

松了口气,苏雅妍放下手里的笔,转过头期待的看着魏主任。

魏主任看这丫头笑眯眯的,有些忍俊不禁,轻轻拍了拍手:“不错,条理清晰,恐怕你看到题的时候心里就已经有数了。”

清了清嗓子,又沉声问道:“魏然,看懂了没有?”

魏然慌张的点点头,脸红的就跟交通灯一样。

唉,这侄子……

“你先回教室去吧,有什么不懂的地方问李老师。”

无奈的摆摆手,这侄子还是欠缺火候,以前表现的挺好啊,怎么最近总是掉链子。

听到魏主任撵他走,魏然反倒是平静了下来,收拾好书包,头也不回的就走了,似乎用仓皇而逃来形容他更贴切一些。

让苏雅妍坐到自己身边,魏主任和气的问道:“吃过晚餐了吧,可别饿着肚子。”

苏雅妍点点头:“那现在就开始考试?”

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