河北省2019年中考数学一轮复习第二章方程(组)与不等式(组)第一节一次方程(组)及其应用好题随堂演练.doc

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1、 1 / 3一次方程(组)及其应用好题随堂演练1在解方程 x 时,方程两边同时乘以 6,去分母后,正确的是( )x 13 3x 12A2x16x3(3x1)B2(x1)6x3(3x1)C2(x1)x3(3x1)Dx1x3(x1)2若代数式 4x5 与 的值相等,则 x 的值是( )2x 12A1 B. C. D232 233(2018东营)小岩打算购买气球装扮学校“毕业典礼”活动会场,气球的种类有笑脸和爱心两种,两种气球的价格不同,但同一种气球的价格相同由于会场布置需要,购买时以一束(4 个气球)为单位,已知第一、二束气球的价格如图所示,则第三束气球的价格为( )A19 元 B18 元 C16

2、 元 D15 元4(2018淮安)若关于 x,y 的二元一次方程 3xay1 有一个解是 ,则 a . x 3y 2)5(2018柳州)篮球比赛中,每场比赛都要分出胜负,每队胜一场得 2 分,负一场得 1 分,艾美所在的球队在 8 场比赛中得 14 分若设艾美所在的球队胜 x 场,负 y 场,则可列出方程组为 6(2017武汉)解方程:4x32(x1)7解方程组: .2x 3 y 3x 2y 2 )2 / 38(2018镇江)小李读一本名著,星期六读了 36 页,第二天读了剩余部分的 ,这两天共读了整本书的14,这本名著共有多少页?38参考答案1B 2.B 3.B 4.4 5. x y 82x y 14)6解:去括号,得 4x32x2,移项,得 4x2x23,合并同类项,得 2x1,系数化为 1,得 x .127解:由得 y32x ,将代入得 3x2(32x)2,解得 x4,将 x4 代入得 y3245,方程组的解为 .x 4y 5)8解:设这本名著共有 x 页根据题意,得36 (x36) x.14 38解得 x216.3 / 3答:这本名著共有 216 页

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