1) 12-20+11+18+6-10= 47-30= 17
2) -42+54-13-26+32= 86-81= 5
3) 3,8-4,4-7,3+15,1= 18,9-11,7= 7,2
4) 459-3715+235= 694-3715= -3021
5) 3512+113-38+214-556= 3839-594= 3245
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Answers & Comments
1) 12-20+11+18+6-10= 47-30= 17
2) -42+54-13-26+32= 86-81= 5
3) 3,8-4,4-7,3+15,1= 18,9-11,7= 7,2
4) 459-3715+235= 694-3715= -3021
5) 3512+113-38+214-556= 3839-594= 3245