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（山西专版）2018年秋七年级数学上册第一章有理数1.4有理数的乘除法1.4.1有理数的乘法（三）课时训练（无答案）（新版）新人教版.doc

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（山西专版）2018年秋七年级数学上册第一章有理数1.4有理数的乘除法1.4.1有理数的乘法（三）课时训练（无答案）（新版）新人教版.doc_第1页
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11.4.1 有理数的乘法（三）基础练习1. 计算：（ 79- 56+ 34-18）（-36） 2. 计算：（1） （-0.25）0.5（-4 27）4；（2） （-47.65）2 61+（-37.15） （-2 61）+10.5（-7 51） 3运用运算 律填空（1）-2（-3 ）=（-3）（_） （2）（- 3）2（ -4）=（- 3） （_） （_）（3） （-5） （-2）+（-3）=（-5）（_）+（_）（-3） 拓展提高4计算（1） （-4）（-18.36）2.5； （2 ） （- 7）0.125（- 213）（-8） ；（3） （- 2+ - 14-5）（-20） ； （4）- 56（1 2-2 -0.6） ；（5） （- 9）（-18）+（- 1）（-3）2 5；（6）（-2）（-4）+（-5）- 3-（-2）（-3）5用简便运算方法计算（1）（48）25-8125；（2）-100 8-0.12535.5+14.5（-12.5%）

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