calculati: a) 10x{18^2:324+2x[(2^2x3)^15:(2^29x3^15)+1^24]}. b) [2^x2^18+5^70:5^10-(3^25)^2]:[4^2x2^3x2^23+(5^15)^2^2-(3^2)^5^2]. Mulțumesc frumos!