Alguem pode me ajudar a resolver essas expressoes numericas com fraçao? por favor


12-5:(-4/3) =

3/7 x (-7/5) - 5/8 : (-5/2) =

(-4/9 + 1/15) : (-5/6 - 1/9) =

4 . (2/9) + (-5/3) : (2/9)

5 . (3/4) -3/4 : (-3/8)


Por favor me ajuda =D
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