這道題不會，數學就很難上90分了 #数学思维 #小学数学 #小学奥数 #趣味数学 #數學補習 #学霸秘籍 #数学 #小學生 #數學 #教育學習
Synopsis
根据已知算式关系，构造出三个圆相加，再利用等量代换，圆的值就出来了。
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