九年级数学上册第21章二次根式21.1二次根式授课课件(新版)华东师大版.ppt

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华师版九年级数学上册,根据下图所示的直角三角形,正方形和等边三角形的条件,完成下面的填空.,直角三角形的斜边长是_,正方形的边长是_ ,等边三角形的边长是_.,写出上面实际情境中表示算术平方根的式子,你认为各代数式的共同特点是什么?,=,非负,4,2,0,0.01,2,0,a,a,

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