4(a-a²-4a³)-3(-a+7a²-2a³) -(x²+y²)+【-3xy-(x²+y²)】计算4(a-a²-4a³)-3(-a+7a²-2a³) -(x²+y²)+【-3xy-(x²+y²)】
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![4(a-a²-4a³)-3(-a+7a²-2a³) -(x²+y²)+【-3xy-(x²+y²)】计算4(a-a²-4a³)-3(-a+7a²-2a³) -(x²+y²)+【-3xy-(x²+y²)】](/uploads/image/z/2589978-66-8.jpg?t=4%EF%BC%88a-a%26%23178%3B-4a%26%23179%3B%EF%BC%89-3%EF%BC%88-a%2B7a%26%23178%3B-2a%26%23179%3B%EF%BC%89+-%EF%BC%88x%26%23178%3B%2By%26%23178%3B%EF%BC%89%2B%E3%80%90-3xy-%EF%BC%88x%26%23178%3B%2By%26%23178%3B%EF%BC%89%E3%80%91%E8%AE%A1%E7%AE%974%EF%BC%88a-a%26%23178%3B-4a%26%23179%3B%EF%BC%89-3%EF%BC%88-a%2B7a%26%23178%3B-2a%26%23179%3B%EF%BC%89+-%EF%BC%88x%26%23178%3B%2By%26%23178%3B%EF%BC%89%2B%E3%80%90-3xy-%EF%BC%88x%26%23178%3B%2By%26%23178%3B%EF%BC%89%E3%80%91)
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4(a-a²-4a³)-3(-a+7a²-2a³) -(x²+y²)+【-3xy-(x²+y²)】计算4(a-a²-4a³)-3(-a+7a²-2a³) -(x²+y²)+【-3xy-(x²+y²)】
4(a-a²-4a³)-3(-a+7a²-2a³) -(x²+y²)+【-3xy-(x²+y²)】
计算4(a-a²-4a³)-3(-a+7a²-2a³)
-(x²+y²)+【-3xy-(x²+y²)】
4(a-a²-4a³)-3(-a+7a²-2a³) -(x²+y²)+【-3xy-(x²+y²)】计算4(a-a²-4a³)-3(-a+7a²-2a³) -(x²+y²)+【-3xy-(x²+y²)】
4(a-a²-4a³)-3(-a+7a²-2a³)
=4a-4a²-16a³+3a-21a²+6a³
=-a-25a²-10a³
-(x²+y²)+【-3xy-(x²+y²)】
=-x²-y²-3xy-x²-y²
=-2x²-3xy-2y²