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设计背景苏教版52-53页面积的变化是在比例尺的知识基础上,通过对比例尺1:n的图上面积与实际面积的比的研究,推理归纳出他们面积的比是1:n~2。现实教
Design background Jiangsu Education Edition pages 52-53 of the change is based on the knowledge of the scale, through the scale 1: n ratio of the area on the map and the actual area of the study, the reasoning concluded that their area ratio is 1: n ~ 2. Realistic teaching