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[500-(3 500 : 700x80 - 40x9)x(64:8)]:9-(72:6):(81:27)=

Răspuns :

[500-(5•80-360)•8]:9-12:3
[500-(400-360)•8]:9-4
[500-40•8]:9-4
[500-320]:9-4
180:9-4
20-4=16