七年级数学上册第三章有理数的运算3.1有理数的加法与减法《有理数的加法(1)》课时训练(新版)青岛版.doc

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七年级数学上册第三章有理数的运算3.1有理数的加法与减法《有理数的加法(1)》课时训练(新版)青岛版.doc_第1页
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有理数的加法(1)一选择题1下列计算正确的是( )A 7)4(3 B 9)(4 C 29 D 632在数轴原点的左边 2 个单位处有一点 P,向数轴正方向移动了 1.5 个单位.则点 P最后所在的数为( )A0.5 B3.5 C2.5 D3.5二填空题3计算:(+ 2.7)+(6.7 )= ,( 0.5 )+( 0.6 )= ,4林林家开了个小商店,前两天盈亏情况如下:(亏为负,单位:元):28.3、-29.6,则小商店这两天的盈亏情况是 。三解答题5在数轴上表示下列有理数的运算,并求出计算结果(4.5)+(1.5) 5+(7) 6某水利勘察队沿某环城河勘察,向上游走的路程(千米) ,记为正,则向下游走的路程(千米)应用 数表示,在这个问题中:(+20)+(+5)的实际意义是:(15)+(+10)的实际意义是:参考答案一选择题1A 2D二填空题3计算:4, 1.1 4亏了 1.3 元三解答题56, 2,图略6答案:负;向上游走了 25 千米;向下游走了 5 千米。

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