標題:
有數學問題請教, P6.-S1
發問:
問1: 2,5,8,9,12,15,17,22,29,Prime numbers:_____________Composite number:____________________問2:write down all the prime numbers between 1and 50.2,__,__,7,11,__,__,19,__,__,31,__,__,__,47問3:write down all the prime numbers from 51 to 100._________________________.問4:show that 361 is... 顯示更多 問1: 2,5,8,9,12,15,17,22,29, Prime numbers:_____________ Composite number:____________________ 問2:write down all the prime numbers between 1and 50. 2,__,__,7,11,__,__,19,__,__,31,__,__,__,47 問3:write down all the prime numbers from 51 to 100. _________________________. 問4:show that 361 is not a prime number . __________________________. 問4:find the units digit of the expression (5×2)+(5×4)+（5×6）+（5×8）+...+（5×998）.briefly explain your answer. 以上問題非常緊急!!!!希望快d有人幫到我>
最佳解答:
答1: 質數:2,5,9,17,29 合成數:8,12,15,22 答2: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47 答3: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,57,59,61,67,71,73,79,83,87,89,91,97 答4:361唔係質數 find the units digit of the expression (5×2)+(5×4)+（5×6）+（5×8）+...+（5×998）.briefly explain your answer. 呢條唔識
其他解答:
1. prime no. 2,5,17,18 Composite no.8,9,12,15,22 2. 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47 3.51,53,57,59,61,67,71,73,79,83,87,89,97 4. 19*19 = 361 so it is not a prime number. 5. All of them are zero, because when 5 multiply with an even number (2,4,6,8), the product must can be divided into 10 easy job!!!|||||1. prime no. 2,5,17,18 Composite no.8,9,12,15,22 2. 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47 3.51,53,57,59,61,67,71,73,79,83,87,89,97 4. 19*19 = 361 so it is not a prime number. 5. All of them are zero, because when 5 multiply with an even number (2,4,6,8), the product must can be divided into 10
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