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When three equilateral triangles with an area of 60 cm2 are arranged in a horizontal row, what is the sum of the areas of the colored parts?
三个等边三角形水平摆放，每个面积为60平方厘米，求染色部分的面积是多少？不需要硬算，训练学生寻找中点，观察边的长度关系和做变换的能力。☎关注我们，一起研究海外留学资料。
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