有幾條數唔明呀 , 請幫忙

2010-09-26 9:13 pm

1. What is the sum of all the prime numbers between 21 and 33 ?

2. What is the difference between the largest and smallest composite number
between 63 and 73 ?

3. What is the product of the smallest prime number and the largest composit
number between 44 and 73 ?

4. Write out the prime number between 50 and 100 .

答案是點解是 : 53 , 59 , 61 , 67 , 79 , 73 , 79, 83, 89 , 97.
而 51 , 57, 63 , 69 , 87 , 是媽 ?

5. What is the difference the smallest prime number and the largest
composite number between 60 and 90 ?

答案是 : 27 點計出來

回答 (1)

用戶2053

2010-09-26 9:46 pm

✔ 最佳答案

1)23 + 29 + 31 = 832)largest composite number = 72
smallest composite number = 64 (Between 意思不包括63)difference between between them = 72 - 64 = 8(若 Between 意思包括63 ,72 - 63 = 9)
3)smallest prime number = 47
largest composit number = 72Product = 47 * 72 = 33844)
53 , 59 , 61 , 67 , 71 , 73 , 79, 83, 89 , 97.而 51 , 57, 63 , 69 , 87 不是 , 因為它們是3的倍數。
5)Between 意思唔包括 60 and 90 ,the smallest prime number = 61
the largest composite number = 8888 - 61 = 27

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