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        公務員考試行測題多量大,掌握這些公式超省時!

        http://www.cuteteenslut.com       2019-03-30 08:42      來源:公考通
        【字體: 】              

          距離2019年公務員聯考筆試只有20多天的時間了,許多同學對數學、資料這兩個模塊卻不知該如何復習,或是計算一道題需要很長的時間,以至于在考場上花費太多的時間。其實在做數學或資料分析題目時,如果使用一些計算公式可以節省很大一部分時間的。

         

          接下來,公考通(www.cuteteenslut.com)小編為大家梳理一些行側數學和資料分析中經常會用到的數學公式,希望對大家有所幫助!


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          1、分數比例形式整除


          若a∶b=m∶n(m、n互質),則a是m的倍數,b是n的倍數。


          若a=m/n×b,則a=m/(m+n)×(a+b),即a+b是m+n的倍數


          2、尾數法


          (1)選項尾數不同,且運算法則為加、減、乘、乘方運算,優先使用尾數進行判定;


          (2)所需計算數據多,計算復雜時考慮尾數判斷快速得到答案。常用在容斥原理中。


          3、等差數列相關公式


          和=(首項+末項)×項數÷2=平均數×項數=中位數×項數;


          項數=(末項-首項)÷項數+1。從1開始,連續的n個奇數相加,總和=n×n,如:1+3+5+7=4×4=16,……


          4、幾何邊端問題相關公式


          (1)單邊線型植樹公式(兩頭植樹):棵樹=總長÷間隔+1,總長=(棵樹-1)×間隔


          (2)植樹不移動公式:在一條路的一側等距離栽種m棵樹,然后要調整為種n棵樹,則不需要移動的樹木棵樹為:(m-1)與(n-1)的最大公約數+1棵;


          (3)單邊環型植樹公式(環型植樹):棵樹=總長÷間隔,總長=棵樹×間隔


          (4)單邊樓間植樹公式(兩頭不植):棵樹=總長÷間隔-1,總長=(棵樹+1)×間隔


          (5)方陣問題:最外層總人數=4×(N-1),相鄰兩層人數相差8人,n階方陣的總人數為n?。


          5、行程問題


          (1)火車過橋核心公式:路程=橋長+車長(火車過橋過的不是橋,而是橋長+車長)


          (2) 相遇追及問題公式:相遇距離=(速度1+速度2)×相遇時間追及距離=(速度1-速度2)×追及時間


          (3)隊伍行進問題公式:隊首→隊尾:隊伍長度=(人速+隊伍速度)×時間;隊尾→隊首:隊伍長度=(人速-隊伍速度)×時間


          (4)流水行船問題公式:順速=船速+水速,逆速=船速-水速


          (5)往返相遇問題公式:


          兩岸型兩次相遇:S=3S1-S2,(第一次相遇距離A為S1,第二次相遇距離B為S2)


          單岸型兩次相遇:S=(3S1+S2)/2,(第一次相遇距離A為S1,第二次相遇距離A為S2);


          左右點出發:第N次迎面相遇,路程和=(2N-1)×全程;第N次追上相遇,路程差=(2N-1)×全程。


          同一點出發:第N次迎面相遇,路程和=2N×全程;第N次追上相遇,路程差=2N×全程。


          6、幾何問題


          (1) 三角形三邊關系公式:


          兩邊之和大于第三邊,兩邊之差小于第三邊。


          (2)勾股定理:


          直角三角形中,兩直角邊的平方和等于斜邊的平方。常用勾股數:(3、4、5);(5、12、13);(6、8、10)。


          (3)內角和定理


          正多邊形內角和定理,n邊形的內角的和等于: (n - 2)×180°(n大于等于3且n為整數)。


          已知正多邊形內角度數,則其邊數為:360°÷(180°-內角度數)。


          7、其他問題


          (1)經濟利潤問題常用公式


          利潤=售價-進價,利潤率=利潤÷進價,總利潤=單利潤×銷量售價=進價+利潤=原價×折扣


          (2)溶液問題基本公式


          溶液=溶質+溶劑,濃度=溶質÷溶液,溶質=溶液×濃度混合溶液的濃度=(溶質1+溶質2)÷(溶液1+溶液2)


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          1、基期量相關

         

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          2、增長量相關

         

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          3、增長率相關

         

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          4、比重相關

         

        \


          掌握這些公式,數學不再難,資料不是坎,那么你的行測還怕什么!



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