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因式分解:m³-2m²-4m+8;x²-2xy+y²-9
人气:195 ℃ 时间:2020-05-19 08:28:04
解答
m³-2m²-4m+8
=m²(m-2)-4(m-2)
=(m-2)(m²-4)
=(m+2)(m-2)²
x²-2xy+y²-9
=(x-y)²-3²
=(x-y+3)(x-y-3)
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