Question

(-3/4)²-[2,5+(-3-1/4):5/2-2³]

Answer 1

(-3/4)²-[2,5+(-3-1/4):5/2-2³]
9/16 - [ 2,5 + (-13/4):5/2 - 8]
9/16 - [2,5 + (-23/20) - 8]
9/16 - (50-23-160)/20
9/16 - (-133/20)
9/16 + 133/20
577/80