(遵义专版)2019中考数学高分一轮复习第一部分教材同步复习第二章方程(组)与不等式(组)课时8一元一次不等式(组)真题在线.doc

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(遵义专版)2019中考数学高分一轮复习第一部分教材同步复习第二章方程(组)与不等式(组)课时8一元一次不等式(组)真题在线.doc_第1页
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1第一部分 第二章 课时 8命题点一 一元一次不等式(组)的解法及其解集的表示1(2017遵义)不等式 64 x3 x8 的非负整数解为( B )A2 个 B3 个 C4 个 D5 个【解析】移项,得4 x3 x86,合并同类项,得7 x14,系数化为 1,得 x2.故其非负整数解为 0,1,2,共 3个2(2015遵义)不等式 3x1 x1 的解集在数轴上表示为( C )A BC D【解析】由 3x1 x1,可得 2x2,解得 x1.所以一元一次不等式 3x1 x1的解集在数轴上表示为 .3(2014遵义)解不等式组:Error!并把不等式组的解集在数轴上表示出来解:由得 x1,由得 x 4,故此不等式组的解集为1 x 4.在数轴上表示解集如答图所示答图.命题点二 一元一次不等式的应用4(2016遵义)三个连续正整数的和小于 39,这样的正整数中,最大一组的和是( B )A39 B36 C35 D34【解析】设三个连续正整数分别为 x1, x, x1.由题意得( x1) x( x1)39,解得 x13. x为整数,2当 x12 时,三个连续正整数的和最大,三个连续正整数的和为 11121336.

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