7/4 . (5/2)^-2 + 9/10 . ( 3+ 1/3) - 1/5 . 5^-1 = 81/25
(5^-1 +1/4) ÷ (- 2/3)^0 - 9/5 . ( -9/2)^-2 = 13/36
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7/4 . (5/2)^-2 + 9/10 . ( 3+ 1/3) - 1/5 . 5^-1 = 81/25
(5^-1 +1/4) ÷ (- 2/3)^0 - 9/5 . ( -9/2)^-2 = 13/36