數 - ( 27 ) 因數
2017/07/04 01:17
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數 - ( 27 ) 因數
發問:
A number , It has 4 因數 ; if this number + 2 , It has 2 因數 ; if this number + 3 , it has 12 因數 , What is the number ? 更新: I say this <<因數>> is 包括 1 and 自己 更新 2: Danny asked you , and I you , 咁你點解一開始就知道係57???
最佳解答:
The number is 57. 因數 of 57 are 1 , 3, 19 and 57 21+2=59, 因數 are 1 and 59 21+3=60, 因數 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 and 60 2010-07-01 20:36:44 補充： Let x to be the number Form the information of question: x has 4 因數 ==> x > or = 6 'x+2' has 2 因數' ==> x is a 質數 Then, try from the smallest 質數 ==> the smallest x is 57. 2010-07-01 20:38:51 補充： I do not know the related 'Number Theory'. I only solve the maths problem by basic principle.
其他解答:
咁你點解一開始就知道係57??? 2010-07-01 17:39:35 補充： 221 can also be the number. factors of 221 = 1,13,17,221 factors of 223 = 1,223 factors of 224 = 1,2,4,7,8,14,16,28,32,56,112,224 呢題係一題number theory既題目,可以用一個multiplicative既concept解決! 當中呢個concept有教點計1 個數既因數數目, 例如: 100=2^2*5^2,因數數目=(2+1)(2+1)=9 224=2^5*7^1,因數數目=(5+1)(1+1)=12 因數數目同佢質因數連乘式中質數既指數有關! 2010-07-01 17:41:47 補充： 我自己曾經讀過有關既概念,所以知道d.
數 - ( 27 ) 因數
發問:
A number , It has 4 因數 ; if this number + 2 , It has 2 因數 ; if this number + 3 , it has 12 因數 , What is the number ? 更新: I say this <<因數>> is 包括 1 and 自己 更新 2: Danny asked you , and I you , 咁你點解一開始就知道係57???
最佳解答:
The number is 57. 因數 of 57 are 1 , 3, 19 and 57 21+2=59, 因數 are 1 and 59 21+3=60, 因數 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 and 60 2010-07-01 20:36:44 補充： Let x to be the number Form the information of question: x has 4 因數 ==> x > or = 6 'x+2' has 2 因數' ==> x is a 質數 Then, try from the smallest 質數 ==> the smallest x is 57. 2010-07-01 20:38:51 補充： I do not know the related 'Number Theory'. I only solve the maths problem by basic principle.
其他解答:
咁你點解一開始就知道係57??? 2010-07-01 17:39:35 補充： 221 can also be the number. factors of 221 = 1,13,17,221 factors of 223 = 1,223 factors of 224 = 1,2,4,7,8,14,16,28,32,56,112,224 呢題係一題number theory既題目,可以用一個multiplicative既concept解決! 當中呢個concept有教點計1 個數既因數數目, 例如: 100=2^2*5^2,因數數目=(2+1)(2+1)=9 224=2^5*7^1,因數數目=(5+1)(1+1)=12 因數數目同佢質因數連乘式中質數既指數有關! 2010-07-01 17:41:47 補充： 我自己曾經讀過有關既概念,所以知道d.
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