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1题目两县城A和B相距20km,现计划在两县城外以AB为直径的半圆弧AB上选择一点C建造垃圾处理厂,其对城市的影响度与所选地点到城市的距离有关,对城A和城B的总影响度为城A与城B的影响度
1 The two counties, A and B, are 20km apart. It is planned to build a waste treatment plant on a semicircular arc AB with a diameter of AB outside the two counties. The impact on the city is related to the distance from the selected place to the city. The total impact on city A and city B is the influence of city A and city B.