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jawab : [(3x.x)+(3x.-2y)+(3x.1)] + [(2y.x)+(2y.-2y)+(2Y.1)
= [ 3x² - 6xy +3x ] + [ 2xy - 4y² + 2y ]
= 3x² -6xy + 2xy + 3x +2y - 4y²
= 3x² -4xy +3x +2y -4y²
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