2(3xy-2x²-3y²)+3(x²-5xy+3y²)
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2(3xy-2x²-3y²)+3(x²-5xy+3y²)2(3xy-2x²-3y²)+3(x²-5xy+3y²)2(3x
2(3xy-2x²-3y²)+3(x²-5xy+3y²)
2(3xy-2x²-3y²)+3(x²-5xy+3y²)
2(3xy-2x²-3y²)+3(x²-5xy+3y²)
2(3xy-2x²-3y²)+3(x²-5xy+3y²)
=6xy-4x²-6y²+3x²-15xy+9y²
=3y²-9xy-x²
3y²-9xy-x²