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1、2019-2020年七年级数学上学期期中教学质量检测答案一、BCADDADBCA二、11.12.(答案不唯一)13.14.2515.1.2a元16.72,（说明：下列各题若有另外的解法，请参照给分）三、17①解：原式=······························2分=·····································4分=··········································6分②解：原式=························
2、····1分=·························2分=·································4分=···································6分③解：原式=·························2分=······································4分=········································6分18解：原式=························
3、2分=·······················4分=·····································6分19.解：=··············2分=····················4分=····································6分20.解：（1）································2分（2）·····5分答：该厂星期一生产工艺品305个；本周实际生产工艺品的数量为2110个.················
4、·····6分21.解：原式=···························1分=····························2分=··········································3分当··········································4分原式=·································5分=··············································6分22.解
5、：由题意的：············4分所以：原式=························6分=··································7分=·········································8分23.解：（1）·····························1分································2分···································4分答：阴影部分边长，面积··
6、·5分（2）······················6分······································7分··················8分·····································9分答：阴影部分边长，面积············10分24.解：（1）（-1,1）························2分（2（-2,）注：答案不唯一························6分（3）由题意得：2m=m2＋2－3即m2－
7、2m=12m－[3m2－2(2m－1)]=6m-3m2－2=-3(m2－2m)-2=-5·········································12分25.解：（1）2,4···············································2分（2）2+t···············································4分（3）秒后点C运动的距离为t个单位长度,点D运动的距离为t个单位长度, 表示的数是t,D表示的数是,···
8、·························5分 ,, ··························6分, ,计算得出:·∴当秒时;, ······························8分(4)假设能相等,则点A表示的数为,C表示的数为t,D表示的数为,B表示的数为12, ············································9分,, ·····11分,
