（2X-3Y)^2-（y+3X)(3X-Y)
=4X^2-12XY+9Y^2-9X^2+Y^2
=10Y^2-12XY-5X^2
=10[Y-(6-√86)X/10][Y-(6+√86)X/10]
希望你能看懂，你能明白， 望采纳，赞同
原式=4x^2-12xy+9y^2-(3xy-xy+9x^2-3xy)
=4x^2-12xy+9x^2-3xy+xy-9x^2+3xy
=4x^2-12xy+xy
=4x^2-11xy
=x(4x-11y)
=4x^2-12xy+9y^2-9x^2+y^2
=10y^2-12xy-5x^2
(X+(6+y*(43^(1/2)))/5)(X+(6-y*(43^(1/2)))/5)
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