如图,从内到外各圈正方形的边长依次是1,2,3,4……通过面积的两种表达形式,就可以证明结论中的著名等式!
解释一下:第一个算式是把面积一圈一圈加起来,第二个是总边长的平方。
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宇宙的心弦
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这是mspaint画的?