福建省龙岩市永定二中七年级（下）数学课外练习试卷（1）

1、2013-2014学年福建省龙岩市永定二中七年级（下）数学课外练习试卷（1）一、选择题（共6小题，每小题3分，满分18分）1如图，下列能判定abcd的条件有（）个（1）b+bcd=180；（2）1=2；（3）3=4；（4）b=5a1b2c3d4显示解析2同一平面内的四条直线若满足ab，bc，cd，则下列式子成立的是（）aadbbdcaddbc显示解析3如图，若mn，1=105，则2=（）a55b60c65d75显示解析4下列说法中正确的是（）a有且只有一条直线垂直于已知直线b从直线外一点到这条直线的垂线段，叫做这点到这条直线的距离c互相垂直的两条线段一定相交d直线c外一点a与直线c上各点连接而

2、成的所有线段中最短线段的长是3cm，则点a到直线c的距离是3cm显示解析5如图，adbc，点e在bd的延长线上，若ade=155，则dbc的度数为（）a155b50c45d25显示解析6如图ab，1与2互余，3=115，则4等于（）a115b155c135d125显示解析二、填空题（共7小题，每小题3分，满分21分）7过一点有且只有与已知直线垂直显示解析8如图，直线ab、cd与直线ef相交于e、f，1=105，当2=时，能使abcd显示解析9若1与2是对顶角，3与2互补，又知3=60，则1=显示解析10如图，直线ab、cd相交于点o，oeab，o为垂足，如果eod=38，则aoc=度，cob=

3、度显示解析11如图，要从小河引水到村庄a，请设计并作出一最佳路线，理由是显示解析12如图，若abde，bcfe，e+b=度显示解析13某宾馆在重新装修后，准备在大厅主楼梯上铺设某种红色地毯，已知这种地毯每平方米售价30元，主楼梯道宽2米，其侧面如图所示，则购买地毯至少需要元显示解析三、解答题（共5小题，满分0分）14读句画图：如图，直线cd与直线ab相交于c，根据下列语句画图：（1）过点p作pqcd，交ab于点q；（2）过点p作prcd，垂足为r；（3）若dcb=120，猜想pqc是多少度？并说明理由显示解析15将以下各推理过程的理由填入横线内如图，b=c，abef试说明：bgf=c解：b=c

4、（已知）abcdabef（已知）efcdbgf=c显示解析16如图，efad，1=2，bac=70将求agd的过程填写完整efad，（）2=（两直线平行，同位角相等；）又1=2，（）1=3（）abdg（）bac+=180（）又bac=70，（）agd=显示解析17已知：如图abcd，ef交ab于g，交cd于f，fh平分efd，交ab于h，age=50，求：bhf的度数显示解析18已知：如图1=2，c=d，问a=f吗？试说明理由c29c91afe4ced1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29

5、c91afedd1b6c87d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91af95ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9d1b6c8795ad9c91afe4ced1b6c8795a1afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91afc91fe4ced1d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6cd1b6c8795ad9c

6、91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91af8795ad9c91fe4ced1d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c87d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91af5d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91afad9c91fe4ced1b

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8、1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8d1b6c8795ad9c91afe4ced1d91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91afc91fe4ced1d1b6c871afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91afc91fe4ced1d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6cd1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795

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