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=10x²-6x²+2y²+9y²-2xy-3xy
=4x²+11y²-5xy
cara pertamanya didistribusiin dulu. jawabannya c
= 10x² -2xy + 2y² -6x² -3xy + 9y²
= 10x² -6x² -2xy -3xy + 2y² + 9y²
= 4x² -5xy + 11y²
semoga dapat membantu