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B. - 2xy + xy - 7xy + 9xy = 10xy - 9xy = xy
C. x²y³ +15x²y³ - 8x²y³ +13x²y³ = 29x²y³ - 8x²y³ = 21x²y³
D. -9m²n³ + 8m²n² - n³m² + 15n²m²
la ordeno
-9m²n³ -m²n³ + 8m²n² + 15m²n² = -10m²n³ +23m²n²