4x²+y²+4xy-12x-6y+9
4x²+y²+4xy-9
2xy-x/2y-y/2x-1
x²+11y²-13xy
@洒龙煜（2x+y-3）²（2x+y-3）（2x+y+3）[（x+y）²-（2xy）²]÷
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