广东省茂名市信宜市七年级数学上册第二章有理数及其运算2.1有理数同步作业(无答案)(新版)北师大版.doc

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广东省茂名市信宜市七年级数学上册第二章有理数及其运算2.1有理数同步作业(无答案)(新版)北师大版.doc_第1页
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121 有理数班别 姓名 基 础题:1零上 13C 记为+13C ,零下 2C 记作( )A2 B2 C2C D2C2下列说法中正确的是( )A一个数不是正数就是负数 B0 不是自然数C 0 是整数 D整数又叫自然数3.如果水位升高 3m时水位变化 记作+3m,那么水位下降 3m 时水位变化记作_,水位升高-7m 时水位变化记作_. 4.如果把每月生产180个零件记作0个,则一月份加工160个零件记作_,二月份加工210个 零件记作_ 。5.“牛牛”饮 料公司的一 种瓶装饮料外包装上有“50030(m L) ”字样,质检局对该产品抽查 5 瓶,容量分别为 503mL,51 1mL,489mL ,4 63mL,527mL,抽查产品的容量中合格的为_ _ .提高题:把下列各数分类,并填在表示相应 集合的大括号里: .40%,17,53.20,18.,732,(1)正数集合: (2)负数集合: (3)正分数 集合: (4)负分数集合: (5)正整数集合: (6)负整数集合:

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