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标题: 机警题请教? [打印本页]

作者: bigmouse    时间: 2003-1-6 14:12     标题: 机警题请教?

14. If K is common multiple of75, 98 ,140, which of the following must be true?
Ⅰ. K is a multiple of 9
Ⅱ. K is a multiple of 49
Ⅲ. K is greater than 14000
确认:Ⅲ对


答案:II怎么不对?
作者: qqqqhhhh    时间: 2003-1-6 14:23

98=5*5*3, 98=2*7*7,  140=7*2*2*5
所以最小公倍数为k=2*2*5*5*7*7=4900
作者: qqqqhhhh    时间: 2003-1-6 14:26

98=5*5*3, 98=2*7*7, 140=7*2*2*5
所以最小公倍数为k=2*2*5*5*7*7*3=4900*3=14700




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