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求阴影部分面积，小学生口算得出答案，用初中的知识反而还复杂了
求阴影部分面积，要以小学五年级学生的思维来解，不能用到勾股定理。求阴影部分面积，小学生口算得出答案，用初中的知识反而还复杂了
小学经典奥数题精选——几何专篇41/105
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