(福建专版)2019春八年级数学下册第十七章勾股定理本章整合课件(新版)新人教版.pptx

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本章整合,1.(2018山东滨州中考)在直角三角形中,若勾为3,股为4,则弦为( ) A.5 B.6 C.7 D.8,答案,答案,2.(2017浙江绍兴中考)如图,小巷左右两侧是竖直的墙,一架梯子斜靠在左墙时,梯子底端到左墙角的距离为0.7 m,顶端距离地面2.4 m,如果保持梯子底端位置不动,将梯子斜靠在右墙时,顶端距离地面2 m,则小巷的宽度为( ). A.0.7 m B.1.5 m C.2.2 m D.2.4 m,3.(2017陕西中考)如图,将两个大小形状相同的ABC和ABC拼在一起,其中点A与A重合,点C落在边AB上,连接BC.若ACB=ACB=90,AC=BC=3,则BC的长为( ).,答案,解析,4.(2017浙江丽水中考改编)我国汉代数学家赵爽为了证明勾股定理,绘制了一幅“弦图”,后人称其为“赵爽弦图”,如图所示.在图中,若正方形ABCD的边长为14,正方形IJKL的边长为2,且IJAB,则正方形EFGH的边长为 .,答案,解析,5.(2018湖北襄阳中考)已知CD是ABC的边AB上的高,若CD= ,AD=1,AB=2AC,则BC的长为 .,答案,

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