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= 4x² + 11y² - 5xy
2.5x² - 2.xy + 2.y² - 3.2x²- 3.xy+ 3.3y²=
10x²-2xy+2y²-6x²-3xy+9y²=
10x²-6x²-2xy-3xy+2y²+9y²=
4x²+5xy+11y²