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25-{27/[(36-27/3)/3]+42/7*3}.

Răspuns :

25-{27:[(36-27:3):3]+42:7×3}=

=25-{27:[(36-9):3]+6×3}

=25-[27:(27:3)+18]

=25-(27:9+18)

=25-(3+18)

=25-21

=4

Sper ca te-am ajutat !