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6 - 6+ 4 - 5 + 13 - 2 - 18 : 3 - 1
6 - 6+ 4 - 5 + 13 - 2 - 6- 1
6+4+13-6-5-2-6-1
23-20
3
b) 3 - [ - 5 × 6 - 4 × ( 12 : 4 - 5 × 2 ) - 24 : 3 ]
3 - [ - 30- 4 × ( 3 - 10 ) - 12 ]
3 - [ - 30- 4 × ( -7 ) - 12 ]
3 - [ - 30+28 - 12 ]
3 - [ -2 - 12 ]
3 - [ -14]
3+14
17