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28-10:{1+3×[(57-60:4×2):3+21]:10}=

Răspuns :

28-10:{1+3×[(57-30):3+21]:10}=
28-10:[1+3×(27:3+21):10]=
28-10:[1+3×(9+21):10]=
28-10:(1+3×30:10)=
28-10:(1+9)=
28-10:10=
28-1=27