文档介绍：寒假初二数学一对一辅导(5)
of rural drinking water sources, protection of drinking water sources in rural areas by the end ，，现对72进行如下操作： 72[] = 8[] = 2[] = 1，这样对72只需进行3次操作后变为1，类似地：只需进行3次操作后变为1的所有正整数中，最大的是 ．
5.：如图在△ABC，△ADE中，∠BAC=∠DAE=90°，AB=AC，AD=AE，点C，D，E三点在同一条直线上，连接BD，BE．以下四个结论：
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities5
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
① BD=CE；② BD⊥CE；③ ∠ACE+∠DBC=45°；④ BE2=2〔AD2+AB2〕，找出其中正确的结论，其中结论正确是_______________
〔第6题图〕
6. 如图，函数y＝2x＋1和y＝－x－2的图像交于点P，根据图像，可得方程组的解为 .
7. 如图，在△ABC中，AB＝，BC＝，∠B＝60°，将△ABC绕点A按顺时针旋转一定角度得到△ADE，当点B的对应点D恰好落在BC边上时，那么CD的长为 .
8. 在平面直角坐标系中，规定把一个正方形先沿着x轴翻折，，正方形ABCD的顶点A、B的坐标分别是〔－1，－1〕、〔－3，－1〕，把正方形ABCD经过连续7次这样的变换得到正方形A′B′C′D′，那么B的对应点B′的坐标是
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities6
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
.
〔第8题图〕
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