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x^2-2xy-8y^2

题目详情
x^2-2xy-8y^2
▼优质解答
答案和解析
=x²-2xy(+y²-y²)-8y²
=(x-y)²-9y²
=(x-y)²-(3y)²
=(x-y+3y)(x-y-3y)
=(x+2y)(x-4y)
够详细了吧