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= 1/81
b) (4/5)^-2 = 1/(4/5)^2
= (5/4)^2
= 25/16
c) 5 x 10^-2 = 0,05
d) (0,2)^-2 = (1/5)^-2
= (5^-1)^-2
= 5^2
= 25
b.gak tau
c.5x10=50²=50x50=250
d.0,2²=0,2x0,2=0,04