Arithmetic Operator Puzzles

#4129: 8 _ 9 _ 8 _ 6 = 20 hard #4130: 8 _ 9 _ 8 _ 6 = -4 medium #4131: 8 _ 9 _ 8 _ 2 = 18 hard #4132: 8 _ 9 _ 8 _ 3 = 3 easy #4133: 9 _ 1 _ 2 _ 8 = 13 hard #4134: 9 _ 1 _ 2 _ 8 = 5 easy #4135: 9 _ 1 _ 3 _ 9 = 6 medium #4136: 9 _ 1 _ 4 _ 8 = 11 hard #4137: 9 _ 1 _ 4 _ 8 = 7 medium #4138: 9 _ 2 _ 2 _ 4 = 8 medium #4139: 9 _ 2 _ 2 _ 2 = 19 hard #4140: 9 _ 2 _ 3 _ 6 = 13 hard #4141: 9 _ 2 _ 3 _ 9 = 3 easy #4142: 9 _ 2 _ 3 _ 3 = 19 hard #4143: 9 _ 2 _ 3 _ 2 = 4 easy #4144: 9 _ 2 _ 3 _ 3 = 3 easy #4145: 9 _ 2 _ 3 _ 4 = 2 easy #4146: 9 _ 2 _ 3 _ 5 = 11 hard #4147: 9 _ 2 _ 3 _ 5 = 1 easy #4148: 9 _ 2 _ 3 _ 6 = 12 hard #4149: 9 _ 2 _ 3 _ 6 = 1 easy #4150: 9 _ 2 _ 3 _ 7 = 13 hard #4151: 9 _ 2 _ 3 _ 7 = -1 easy #4152: 9 _ 2 _ 3 _ 8 = 14 hard #4153: 9 _ 2 _ 3 _ 8 = -2 medium #4154: 9 _ 2 _ 3 _ 9 = -3 medium #4155: 9 _ 2 _ 4 _ 8 = 13 hard #4156: 9 _ 2 _ 4 _ 8 = 8 medium #4157: 9 _ 2 _ 4 _ 2 = 8 medium #4158: 9 _ 2 _ 4 _ 6 = 6 medium #4159: 9 _ 2 _ 4 _ 4 = 17 hard #4160: 9 _ 2 _ 4 _ 1 = 19 hard #4161: 9 _ 2 _ 4 _ 3 = 15 hard #4162: 9 _ 2 _ 4 _ 4 = 14 hard #4163: 9 _ 2 _ 4 _ 5 = 13 hard #4164: 9 _ 2 _ 4 _ 6 = 3 easy #4165: 9 _ 2 _ 4 _ 7 = 11 hard #4166: 9 _ 2 _ 4 _ 9 = 9 medium #4167: 9 _ 2 _ 5 _ 5 = 19 hard #4168: 9 _ 2 _ 5 _ 6 = 15 hard #4169: 9 _ 2 _ 6 _ 6 = 17 hard #4170: 9 _ 2 _ 6 _ 2 = 5 easy #4171: 9 _ 2 _ 6 _ 2 = 1 easy #4172: 9 _ 2 _ 6 _ 3 = 6 medium #4173: 9 _ 2 _ 6 _ 3 = 1 easy #4174: 9 _ 2 _ 6 _ 4 = 7 medium #4175: 9 _ 2 _ 6 _ 4 = -1 easy #4176: 9 _ 2 _ 6 _ 5 = -2 medium