Ответ:\(7+5-8=12-8=4\).\(4+9-6=13-6=7\).\(8+7-5=15-5=10\).\(10+3-4=13-4=9\).\(2+10-6=12-6=6\).\(19-10+3=9+3=12\).\(9+2-1=11-1=10\).\(9+3-2=12-2=10\).\(9+4-3=13-3=10\).