2019年春七年级数学下册第六章实数6.3实数第1课时实数的概念课堂练习(新版)新人教版.docx

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1第六章 实数6.3_实数_第 1 课时 实数的概念1下列各数中,3.141 59, ,0.131 131 113, , ,无理数的个38 2517数有( )A1 个 B2 个 C3 个 D4 个22018郴州下列实数:3,0, ,0.35,其中最小的实数是( )12 2A3 B0 C D0.35232017泰安下列四个数:3, ,1,其中最小的数是( )3A B3 C1 D 34下列说法错误的是( )A. 是有理数 B. 是无理数327 3C. 不是分数 D. 的平方根是322 95下列判断中,错误的是( )A无限小数是无理数 B无限不循环小数是无理数C. 是无理数 D圆周率 是无理数36关于 的叙述,错误的是( )12A. 是有理数 B面积为 12 的正方形的边长是12 12C30) ,0( a 0) , a( a0) ,0( a 0) , a( a0) .)(2) x3, x10,当 x3 时, | x1| x1;( x 1) 2(3)由题可得 | a|.a2

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