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Va rog urgent! Orice ajuta,Dau coroana!!!

Determinati numarul natural x care verifica egalitatea: a) (4^x)^2=2^8,b) (10^x)^5x100=(2^4x5^4)^8,c) (5^2)^x+3 = 5^4xx5^2,d) x:(2^3)^0=1