2x²-xy-2y²因式分解
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原式=2x^2-xy+(1/2)y^2-(5/2)y^2
=(√2x-y/√2)^2-(5/2)y^2
=(√2x-y/√2+√5y/√2)(√2x-y/√2-√5y/√2)
=[√2x+(√5-1)y/√2][√2x-(√5+1)y/√2]
=2[x+(√5-1)y/2][x-(√5+1)y/2]
=(√2x-y/√2)^2-(5/2)y^2
=(√2x-y/√2+√5y/√2)(√2x-y/√2-√5y/√2)
=[√2x+(√5-1)y/√2][√2x-(√5+1)y/√2]
=2[x+(√5-1)y/2][x-(√5+1)y/2]
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