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(-5)^10÷(-5)^9×(-4)^8÷(-4)^7×(-7)^6÷(-7)^5×(--5)^4÷(-5)^3×(-3)^2÷(-3)=



1-{2+(3-4)-[6-(7-8)+(9-10)]-11}+12=


Ma puteti ajuta va rog cat mai repede am nevoie.Multumesc!!!!!​