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一、问题的提出人教版七年级数学下册第七章第2节(第73页)设置了一个探究,原文如下:探究根据以下条件画一幅示意图,标出学校和小刚家、小强家、小敏家的位置.小刚家:出校门向东走1500m,再向北走2000m.小强家:出校门向西走2000m,再向北走3500m,最后向东走500m.小敏家:出校门向南走1000m,再向东走3000m,最后向南走750m.如图7.2-2,选学校所在位置为原点,分别以正
First, the issue of PEP 7 grade mathematics volume Chapter VII, Section 2 (page 73) set up an inquiry, the original text is as follows: Inquiry under the following conditions to draw a schematic diagram, marked the school and Xiaogang, Xiaoqiang Xiaogang: out of the school gate to the east 1500m, then go north 2000m. Xiaoqiang home: out of the school gate to go west 2000m, and then go north 3500m, and finally go east 500m. : Exit the school gate to go south 1000m, and then go east 3000m, and finally to the south 750m .As shown in Figure 7.2-2, choose the location of the school as the origin, respectively, positive