为什么a²+b²=(a+b)² -2ab还有1、a²+b²=+2ab 2、(a+b)²-(a-b)²=4ab 3、(a+b)²-(a-b)²=2a²+2b² 是怎么来的
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![为什么a²+b²=(a+b)² -2ab还有1、a²+b²=+2ab 2、(a+b)²-(a-b)²=4ab 3、(a+b)²-(a-b)²=2a²+2b² 是怎么来的](/uploads/image/z/2576573-53-3.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%88a%26%23178%3B%2Bb%26%23178%3B%3D%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B+-2ab%E8%BF%98%E6%9C%891%E3%80%81a%26%23178%3B%2Bb%26%23178%3B%3D%2B2ab+2%E3%80%81%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B-%EF%BC%88a-b%EF%BC%89%26%23178%3B%3D4ab+3%E3%80%81%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B-%EF%BC%88a-b%EF%BC%89%26%23178%3B%3D2a%26%23178%3B%2B2b%26%23178%3B+%E6%98%AF%E6%80%8E%E4%B9%88%E6%9D%A5%E7%9A%84)
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