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a) (5*0,2)^5*(10:2)^5= 1^5 *5^5=1*25=25
b) (4*4,5)^4:(18:9)^4=18^4:2^4=9^4
c) (2*5*8)^6)^3:(20*4)^9)^2=80^18:80^18=1