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a) (2/7)^-3 * (-2/7)^4=2/7
b) (3/5)^-11 -0,6^9 * (3/5)^3=275,634018
c) ((-1,2)^2)^-1)^-1=1/4
d) (5/3)^3*(3/10)^3*(2/7)^3=1/343
e) (1/2)^7:(0,4)^7*(1/3)^7=2,180325369*10^-3
f) (((-2,49)^-1)^-1)^-1=-100/249
g) (36/25)^-3:(4 4/5)^-3=1000/27
h) (2 1/4)^9:(2,25)^10=4/9