计算:(1)(-2y²)³+y×y^5 (2)[(m+3n)²-(m-3n)²]÷(-3mn)因式分解:(1)a³b-3abc(2)a²-4b²
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![计算:(1)(-2y²)³+y×y^5 (2)[(m+3n)²-(m-3n)²]÷(-3mn)因式分解:(1)a³b-3abc(2)a²-4b²](/uploads/image/z/5455401-33-1.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%89%28-2y%26%23178%3B%29%26%23179%3B%2By%C3%97y%5E5+%EF%BC%882%EF%BC%89%5B%EF%BC%88m%2B3n%EF%BC%89%26%23178%3B-%EF%BC%88m-3n%EF%BC%89%26%23178%3B%5D%C3%B7%EF%BC%88-3mn%EF%BC%89%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A%EF%BC%881%EF%BC%89a%26%23179%3Bb-3abc%EF%BC%882%EF%BC%89a%26%23178%3B-4b%26%23178%3B)
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