2x² + 4y² – x² – 5xy + 2y²

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2x² + 4y² – x² – 5xy + 2y²

X2+6y2-5xy……………………

2x^ + 4y^ – x^ – 5xy + 2y^
2x^ – x^ +4y^ + 2y^ – 5xy
x^ + 6y^ – 5xy

ket. : ^ » pangkat dua

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