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-3x² + xy²= -3 × (⅓)² + ⅕×9² = -¹/₃ + 27 = 26²/₃
b)-½x³y-⅔xy+½x³y+½x³y-⅓xy = ½x³y - xy
½x³y - xy = ½(¹/₃)³×9 - ¹/₃×9 = ¹/₆ - ¹/₃ = -¹/₆