既然阴影面积与边长无关, 那E是正方形中点时也行, 只要满足DE=6, DE垂直于EC就行。
小学五年级, 嘿嘿
既然阴影面积与边长无关, 那E是正方形中点时也行, 只要满足DE=6, DE垂直于EC就行。
小学五年级, 嘿嘿
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