有兩條數學題目我想請教下
1.show that 361 is not a prime number
2.find the units digit of the expression(5x2)+(5x4)+(5x6)+(5x8)+......+(5x998)
Briefly explain your answer.
請教兩條數學題目
2010-07-19 2:55 am
回答 (2)
2010-07-19 3:25 am
✔ 最佳答案
(1)361=1x361=19x19
(2){[(5x2)+(5x998)]/2}x(998/2)
參考: Pan Lloyds Mathematics Companion-Summer Revision
2010-07-19 8:52 am
because of 樓上's answer,the units digit of the expression is 0.
參考: pan lloyds mathematics companion-summer revision
收錄日期: 2021-04-16 00:51:40
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