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

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