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a)3/9+7/9-2/9=8/9=0.888888889
b)(5/9)²÷ -2/9⇒25/81÷-2/9= -225/729
c)(-3/9)² - (1/3)²⇒1/9 - 1/9=0
d)(-17/5)÷(21/9-6/5)⇒= -3