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a)5-1supra8-[3-(5supra2-1supra4)=

Răspuns :

5-1/8-[3-(5/2-1/4)]=5-1/8-(3-9/4)=5-1/8-3/4=33/4
5-1/8-[3-(5/2-1/4)=39/8(3−(5/21/4))=39/8(3−9/4)=39/83/4=33/8