Arithmetic Operator Puzzles

#145: 1 _ 3 _ 9 _ 5 = -2 medium #146: 1 _ 3 _ 9 _ 5 = 15 hard #147: 1 _ 3 _ 9 _ 6 = 9 medium #148: 1 _ 3 _ 9 _ 6 = -3 medium #149: 1 _ 3 _ 9 _ 7 = 10 medium #150: 1 _ 3 _ 9 _ 8 = 11 hard #151: 1 _ 3 _ 9 _ 8 = -5 medium #152: 1 _ 3 _ 9 _ 9 = 12 hard #153: 1 _ 3 _ 9 _ 9 = -6 medium #154: 1 _ 4 _ 2 _ 8 = 2 easy #155: 1 _ 4 _ 2 _ 3 = 7 easy #156: 1 _ 4 _ 2 _ 4 = 9 easy #157: 1 _ 4 _ 2 _ 9 = 19 hard #158: 1 _ 4 _ 2 _ 3 = -5 easy #159: 1 _ 4 _ 2 _ 4 = -7 easy #160: 1 _ 4 _ 2 _ 5 = -9 easy #161: 1 _ 4 _ 2 _ 2 = 3 easy #162: 1 _ 4 _ 2 _ 4 = 8 easy #163: 1 _ 4 _ 2 _ 5 = 10 easy #164: 1 _ 4 _ 2 _ 8 = 4 easy #165: 1 _ 4 _ 3 _ 2 = 7 easy #166: 1 _ 4 _ 3 _ 6 = 3 easy #167: 1 _ 4 _ 3 _ 6 = 9 easy #168: 1 _ 4 _ 3 _ 9 = 13 hard #169: 1 _ 4 _ 3 _ 2 = -5 easy #170: 1 _ 4 _ 3 _ 6 = -1 easy #171: 1 _ 4 _ 3 _ 6 = -7 easy #172: 1 _ 4 _ 3 _ 9 = 12 medium #173: 1 _ 4 _ 3 _ 8 = 6 easy #174: 1 _ 4 _ 4 _ 2 = 9 easy #175: 1 _ 4 _ 4 _ 8 = 3 easy #176: 1 _ 4 _ 4 _ 2 = -7 easy #177: 1 _ 4 _ 4 _ 8 = -1 easy #178: 1 _ 4 _ 4 _ 4 = 3 easy #179: 1 _ 4 _ 4 _ 2 = 8 easy #180: 1 _ 4 _ 4 _ 8 = 2 easy #181: 1 _ 4 _ 5 _ 2 = -9 easy #182: 1 _ 4 _ 5 _ 5 = 3 easy #183: 1 _ 4 _ 5 _ 2 = 10 easy #184: 1 _ 4 _ 6 _ 3 = 9 easy #185: 1 _ 4 _ 6 _ 8 = 4 easy #186: 1 _ 4 _ 6 _ 3 = -7 easy #187: 1 _ 4 _ 6 _ 8 = -2 easy #188: 1 _ 4 _ 6 _ 9 = -5 medium #189: 1 _ 4 _ 6 _ 2 = 7 easy #190: 1 _ 4 _ 6 _ 6 = 3 easy #191: 1 _ 4 _ 6 _ 9 = 6 easy #192: 1 _ 4 _ 6 _ 2 = 3 easy