a(a+4b)-(a+2b)(a-2b)分解完是不是a²+4ab-(a²-2b²)
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![a(a+4b)-(a+2b)(a-2b)分解完是不是a²+4ab-(a²-2b²)](/uploads/image/z/437452-52-2.jpg?t=a%28a%2B4b%29-%28a%2B2b%29%28a-2b%29%E5%88%86%E8%A7%A3%E5%AE%8C%E6%98%AF%E4%B8%8D%E6%98%AFa%26%23178%3B%2B4ab-%EF%BC%88a%26%23178%3B-2b%26%23178%3B%EF%BC%89)
a(a+4b)-(a+2b)(a-2b)分解完是不是a²+4ab-(a²-2b²)
a(a+4b)-(a+2b)(a-2b)分解完是不是a²+4ab-(a²-2b²)
a(a+4b)-(a+2b)(a-2b)分解完是不是a²+4ab-(a²-2b²)
a(a+4b)-(a+2b)(a-2b)=a²+4ab-(a²-2b²)=a²+4ab-a²+2b²=2b(2a+b)