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1.x²-xy+1/4y²-1 (a²+b²)²-8(a²+b²)
人气:493 ℃ 时间:2019-11-07 08:45:05
解答
1.x²-xy+1/4y²-1
=(x-1/2y)²-1
=(x-1/2y+1)(x-1/2y-1)
(a²+b²)²-8(a²+b²)
=(a²+b²)(a²+b²-8)
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