因式分解:(1)8a-4a²-4 (2)1/2(5a+3b)+1/2a² (3)x²(a-b)²-14xy(a-b)49y²
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![因式分解:(1)8a-4a²-4 (2)1/2(5a+3b)+1/2a² (3)x²(a-b)²-14xy(a-b)49y²](/uploads/image/z/2639753-17-3.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A%281%298a-4a%26%23178%3B-4+%EF%BC%882%EF%BC%891%2F2%EF%BC%885a%2B3b%29%2B1%2F2a%26%23178%3B+%283%29x%26%23178%3B%28a-b%29%26%23178%3B-14xy%28a-b%2949y%26%23178%3B)
因式分解:(1)8a-4a²-4 (2)1/2(5a+3b)+1/2a² (3)x²(a-b)²-14xy(a-b)49y²
因式分解:(1)8a-4a²-4 (2)1/2(5a+3b)+1/2a² (3)x²(a-b)²-14xy(a-b)49y²
因式分解:(1)8a-4a²-4 (2)1/2(5a+3b)+1/2a² (3)x²(a-b)²-14xy(a-b)49y²
(1)8a-4a²-4
=-4(a²-2a+1)
=-4(a-1)²
(2)1/2(5a+3b)+1/2a²
=1/2(5a+3b+a²)
(3)x²(a-b)²-14xy(a-b)+49y²
=(xa-xb-7y)²