Hard Arithmetic Puzzles

#4152: 9 _ 2 _ 3 _ 8 = 14 hard #4155: 9 _ 2 _ 4 _ 8 = 13 hard #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 #4165: 9 _ 2 _ 4 _ 7 = 11 hard #4167: 9 _ 2 _ 5 _ 5 = 19 hard #4168: 9 _ 2 _ 5 _ 6 = 15 hard #4169: 9 _ 2 _ 6 _ 6 = 17 hard #4177: 9 _ 2 _ 6 _ 5 = 15 hard #4181: 9 _ 2 _ 6 _ 8 = 11 hard #4184: 9 _ 2 _ 6 _ 8 = 19 hard #4185: 9 _ 2 _ 6 _ 9 = 18 hard #4187: 9 _ 2 _ 7 _ 7 = 19 hard #4188: 9 _ 2 _ 7 _ 7 = 17 hard #4191: 9 _ 2 _ 8 _ 4 = 20 hard #4192: 9 _ 2 _ 8 _ 8 = 19 hard #4193: 9 _ 2 _ 8 _ 2 = 14 hard #4194: 9 _ 2 _ 8 _ 4 = 16 hard #4195: 9 _ 2 _ 8 _ 2 = 18 hard #4199: 9 _ 2 _ 9 _ 9 = 19 hard #4200: 9 _ 2 _ 9 _ 9 = 17 hard #4203: 9 _ 2 _ 9 _ 7 = 14 hard #4204: 9 _ 2 _ 9 _ 8 = 16 hard #4206: 9 _ 3 _ 2 _ 4 = 15 hard #4208: 9 _ 3 _ 2 _ 8 = 19 hard #4211: 9 _ 3 _ 2 _ 5 = -7 hard #4212: 9 _ 3 _ 2 _ 6 = -9 hard #4215: 9 _ 3 _ 2 _ 5 = 11 hard #4217: 9 _ 3 _ 2 _ 6 = 12 hard #4220: 9 _ 3 _ 2 _ 8 = 14 hard #4222: 9 _ 3 _ 2 _ 9 = 15 hard #4226: 9 _ 3 _ 3 _ 5 = 18 hard #4229: 9 _ 3 _ 3 _ 4 = -9 hard #4230: 9 _ 3 _ 4 _ 2 = 15 hard #4231: 9 _ 3 _ 4 _ 6 = 11 hard #4235: 9 _ 3 _ 4 _ 2 = 11 hard #4236: 9 _ 3 _ 4 _ 3 = -9 hard #4237: 9 _ 3 _ 4 _ 1 = 13 hard #4239: 9 _ 3 _ 4 _ 4 = 16 hard #4241: 9 _ 3 _ 4 _ 5 = 17 hard #4243: 9 _ 3 _ 4 _ 7 = 19 hard #4245: 9 _ 3 _ 4 _ 8 = 20 hard #4249: 9 _ 3 _ 5 _ 2 = -7 hard #4250: 9 _ 3 _ 5 _ 1 = 14 hard #4251: 9 _ 3 _ 5 _ 4 = 19 hard