因式分解:(1)-1+(9/49x²) (2)-2x²+2xy-(1/2y²)
1个回答
(1)-1+(9/49x²)
=9/49x²-1
=(3/7x+1)(3/7x-1)
(2)-2x²+2xy-(1/2y²)
=-1/2(4x²-4xy+y²)
=-1/2(2x-y)²
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