2019年春八年级数学下册第16章分式16.1分式及其基本性质16.1.1分式练习(新版)华东师大版.docx

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1、116.1 1.分式一、选择题1在 , , , 各式中,分式有 ( )2x 34 3bx 2 2xx 3y x2 1x 1 链 接 听 课 例 1归 纳 总 结A2 个 B3 个 C4 个 D5 个22017重庆 要使分式 有意义, x应满足的条件是( )4x 3A x3 B x3C x1,解不等式组(2)得 x0的解集是 x1或 x1或 x0,所以无论 a为何实数,分式 一定有意a 1a2 1义5解析 A 共能住(m1)人,每间住 n人,房间数为 .m 1n6答案 答案不唯一,例如: , ,23aa2 13a 2a2 17答案 x2解析 要使分式 有意义,则 x20,即 x2.1x 28答案

2、 10aa 1解析 家与学校的距离是 10a米9答案 100a b解析 买一份奖品需要(ab)元,根据单价、数量和总价的关系即可得出可买的奖品数量10答案 (1) n1x2n 1yn解析 根据已知的式子可以得到规律:第奇数个式子的符号是正,第偶数个式子的符号是负;第 n个分式的分子中 x的次数是 2n1,分母中 y的次数是 n,故第 n个式子是(1) n1 .x2n 1yn11解:整式有: , , ;a b2 x 23分式有: , , .1m 1x y 3x2 112解:(1)由分母 2x10 得 x ,当 x 时,分式 有意义;12 12 3x 62x 1由分子 3x60 得 x2,且当 x2 时分母 2x10,当 x2 时,分式 的值3x 62x 1为零(2)由分母 x20 得 x2,当 x2 时,分式 有意义;|x| 2x 2由分子|x|20 得 x2,且当 x2 时,分母 x20,当 x2 时分母x20,4当 x2 时,分式 的值为零|x| 2x 2素养提升解:根据题意,得 0,x 12x 1则有(1) 或(2)x 1 0,2x 1 0) x 1 0,2x 1 0, )解不等式组(1)得 x1;不等式组(2)无解,12不等式 0 的解集是 x1,x 12x 1 12当 x1 时,分式 的值为负数12 x 12x 1

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