(x³ )²-(y³)²=(x³-y³)(x³+y³)=(x-y)(x²+xy+y²)(x+y)×(x²-xy+y²)第三步怎么得的
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![(x³ )²-(y³)²=(x³-y³)(x³+y³)=(x-y)(x²+xy+y²)(x+y)×(x²-xy+y²)第三步怎么得的](/uploads/image/z/6926414-14-4.jpg?t=%28x%26%23179%3B+%EF%BC%89%26%23178%3B-%EF%BC%88y%26%23179%3B%29%26%23178%3B%3D%28x%26%23179%3B-y%26%23179%3B%29%28x%26%23179%3B%2By%26%23179%3B%29%3D%EF%BC%88x-y%29%28x%26%23178%3B%2Bxy%2By%26%23178%3B%29%28x%2By%29%C3%97%28x%26%23178%3B-xy%2By%26%23178%3B%29%E7%AC%AC%E4%B8%89%E6%AD%A5%E6%80%8E%E4%B9%88%E5%BE%97%E7%9A%84)
(x³ )²-(y³)²=(x³-y³)(x³+y³)=(x-y)(x²+xy+y²)(x+y)×(x²-xy+y²)第三步怎么得的
(x³ )²-(y³)²
=(x³-y³)(x³+y³)
=(x-y)(x²+xy+y²)(x+y)×(x²-xy+y²)
第三步怎么得的
(x³ )²-(y³)²=(x³-y³)(x³+y³)=(x-y)(x²+xy+y²)(x+y)×(x²-xy+y²)第三步怎么得的
有公式的
x³-y³=(x-y)(x²+xy+y²)
x³+y³=(x+y)(x²-xy+y²)
初中时候有的老师会讲,最好背一下很有用的
公式,立方差公式。