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(1/4+4/9)^-1=(9/36+16/36)^-1=(25/36)^-1=36/25
2.
[(9/4)^-1 - 1/36]^-2 = (4/9-1/36)^-2=(16/36-1/36)^-2=(25/36)^-2=(36/25)^2
3.
przyjmuje ze jest blad w zapisie powinno byc (1 1/4)^-2
(4/5)^2+1/10=16/25+1/10=32/50+5/50=37/50
4.
[(5/6+2/3-3/4)^-1]^-2= [(10/12+8/12-9/12)^-1]^-2=(12/9)^-2=81/144
5.
[3/10-2/5+3/4]^-1=(6/20-8/20+15/20)^-1=20/13