(江西专用)2019中考数学总复习第一部分教材同步复习第二章方程(组)与不等式(组)第5讲一次方程(组)权威预测.doc

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(江西专用)2019中考数学总复习第一部分教材同步复习第二章方程(组)与不等式(组)第5讲一次方程(组)权威预测.doc_第1页
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1第一部分 第二章 第 5 讲1江西某旅行社组织甲、乙两个旅游团分别到庐山、婺源旅游,已知这两个旅游团共有 55 人,甲旅游团的人数比乙旅游团的人数的 2 倍少 5 人,问甲、乙两个旅游团各有多少人?设甲、乙两个旅游团各有 x 人、 y 人,根据题意可列方程组为Error!2为了美化校园,某中学计划在进校门后的一段 100.2 m 长的笔直道路旁放置一排装饰花盆,已知每个花盆底部是圆形,直径为 0.2 m,且每排的路两头必须各放置一个花盆,设相邻两个花盆的间距均为 d(单位:m)(1)若 d0.8 m,则需要多少个花盆?(2)若有 150 个花盆,求 d 的值(精确到 0.01 m)第 2 题图解:(1)设需要 n 个花盆10020.2 n( n1)0.8,解得 n101.答:需要 101 个花盆(2)1500.2(1501) d100.2,解得 d0.47.答:相邻两个花盆的间距约为 0.47 m.

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