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  • 【GMAT數(shù)】all of the following have the same number of distinct prime factors except:20,21,24,30,45

    【GMAT數(shù)】all of the following have the same number of distinct prime factors except:20,21,24,30,45
    【GMAT數(shù)學(xué)】all of the following have the same number of distinct prime factors except:(A)20(B)21(C)24(D)30(E)45,
    答案為什么是D
    我的理解:20=2*2*5,21=3*7,24=2*2*2*3,30=2*3*5,45=3*3*5,
    21,24,30,45的公因數(shù)3相同,所以選A,我錯在哪兒?
    數(shù)學(xué)人氣:856 ℃時間:2020-03-24 10:08:59
    優(yōu)質(zhì)解答
    the same number of distinct prime factors 意思是說數(shù)量,不是數(shù)字啦,D是有3個質(zhì)數(shù),其他都是兩個,所以就是它了,數(shù)學(xué)它就是有時候跟你玩文字游戲的,要小心看題的啦~
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