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[1+2×(6+6:3)-5]:6=;1000-[409×(6:3)+56:8×5]=;[(35:7+21:7)×7+(3+9:3+27)]×7=

Răspuns :

[1+2×8-5]:6
(1+16-5):6=12:6=2
[1+2(6+6:3)-5]:6=3.6
1000-[409×(6÷3)+56:8×5]=-147
[(35:7+21:7)×7+(3+9:3+27)]×7=630