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2x²-xy²-5x²+2xy² =
-3x²+xy² =
-3*⅓²+⅓*9² =
-3*1/9+⅓*81 =
-⅓+27 = 26⅔
b)
-1/2x³y-2/3xy+1/2x³y-1/3xy =
-xy =
-⅓*9 = -3