20 БАЛЛОВ! реши:
-9+15; 10-12; -10-7; -9+5; 14+(-16)
-15+20; -12-8; -13+6; 16-20; 17+(-13)
6-8; -12+4; -3-6; -7+10; 10+(-6)
-7-5; 23+(-25); -20+7; 18-14; -10+13
34+(-16); 9-12; -17+23; -14-4; -23+7
-9+15; 10-12; -10-7; -9+5; 14+(-16)
-15+20; -12-8; -13+6; 16-20; 17+(-13)
6-8; -12+4; -3-6; -7+10; 10+(-6)
-7-5; 23+(-25); -20+7; 18-14; -10+13
34+(-16); 9-12; -17+23; -14-4; -23+7
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