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b)(1/2)^-1 +(1/5)^-1+(1/27)^-1 :(1/3)^-2 / 3*(pierw z 2/3)^-2 +(2/9)^-1+(-pierw z 3)^0=
licznik: 2+5+27:3^2=7+27:9=7+3=10
mianownik:3* 3/2+9/2-1=9/2+9/2-1=18/2-1=9-1=8
10/8=1,25(całe wyrazenie )