c) [0,5³-(3/2)³]:1/8
d) [(0,25+1/2-5/8)÷1/4]^-1
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C) [0,5³-(3/2)³]:1/8
=[(1/2)³-(3/2)³]:1/8
=(1/8-27/8)1/8
=0,125-3,375/0,125
=-3,25/0,125
=-26
D) [(0,25+1/2-5/8)÷1/4]^-1
=[(0,75-0,625)÷1/4]^-1
=(0,125/0,25)^-1
=0,5^-1
=1/0,5
=2
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