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 直观演示(证明)

(a + b)² = a² + 2ab + b²

借助几何图形的动态变化,有助于理解抽象的数学公式。
 https://t.co/NCG8qS1boB https://video.twimg.com/ext_tw_video/1730136661915324416/pu/vid/avc1/498x500/9aVfwOnmMi3sNJ70.mp4?tag=12