x+2y=1/3 x-5y=-1/2 求6x^2-18xy-60y^2
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x+2y=1/3 x-5y=-1/2 求6x^2-18xy-60y^2
6x^2-18xy-60y^2
=6(x^2-3xy-10y^2 )
=6(x-5y)(x+2y)
=6*(-1/2)*1/3
=-1
=6(x^2-3xy-10y^2 )
=6(x-5y)(x+2y)
=6*(-1/2)*1/3
=-1
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