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33+9:3×10-(60:10×4-20)

Răspuns :

33+9:3x10-(60:10x4-20)
33+3x10-(6x4-20)
33+30-(24-20)
63-4=59 
33+3x10-(6x4-20)=33+30-(24-20)=
=33+30-4=63-4=59