不太清楚,How many positive integers less than 1000 are multiples of 5 and are equal to 3 times an even integer?2.since all of these integers are equal to 3 times an even integer,they are all multiples of 3 and 2
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不太清楚,How many positive integers less than 1000 are multiples of 5 and are equal to 3 times an even integer?2.since all of these integers are equal to 3 times an even integer,they are all multiples of 3 and 2
不太清楚,How many positive integers less than 1000 are multiples of 5 and are equal to 3 times an even integer?2.since all of these integers are equal to 3 times an even integer,they are all multiples of 3 and 2
不太清楚,How many positive integers less than 1000 are multiples of 5 and are equal to 3 times an even integer?2.since all of these integers are equal to 3 times an even integer,they are all multiples of 3 and 2
小于1000的正整数中有多少既是5的倍数,又是某个偶数的3倍?
既然这些整数是某些偶数的三倍,那么他们一定是3和2的公因数.
首先问题1本身稍有难度,但由于2根本不是一个问题,相反为问题1提供了相当重要的思路,于是整个问题变得非常简单.
2说得更具体些就是既然这些整数是某些偶数的三倍,那他们一定是2*3=6的倍数（2和3互质）
思路就是找出小于1000的正整数中既是5的倍数又是6的倍数的有多少个.5和6互质,那么就找5和6的公倍数（即30的倍数）.1000/30取整,得33个.
1.有多少小于1000的正整数是五的倍数或等于3倍并且是整数? 2。所有这些整数等于3倍数而且是整数,所以他们都是3和2的倍数。。。【感觉有点怪】
1、一百以内有几个整数既是五的倍数，也是一个偶数的三倍。
2、因为这些整数都是一个偶数的三倍，他们就都是3和2的倍数。
（其实就是在问100以内有几个整数同时是5,3,2的倍数）