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  • In the decimal representation of x,where 0 < x < 1,is the tenths digit of x nonzero?

    In the decimal representation of x,where 0 < x < 1,is the tenths digit of x nonzero?
    (1) 16x is an integer.
    (2) 8x is an integer.
    A.Statement (1) ALONE is sufficient,but statement (2) alone is not sufficient.
    B.Statement (2) ALONE is sufficient,but statement (1) alone is not sufficient.
    C.BOTH statements TOGETHER are sufficient,but NEITHER statement ALONE is sufficient.
    D.EACH statement ALONE is sufficient.
    E.Statements (1) and (2) TOGETHER are NOT sufficient.
    數(shù)學人氣:722 ℃時間:2020-05-23 16:12:16
    優(yōu)質(zhì)解答
    選b.題目是說,x是一個0到1之間的數(shù),問當x以小數(shù)形式表示時,其十分位是否是非零數(shù)字.先看1,16x是整數(shù),那么1/16,2/16都可以,而1/16=0.0625,2/16=0.125,不能確定x的十分位到底是不是非零.再看2,8x是整數(shù),那么x至少等于1...
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