Hard Arithmetic Puzzles

#4252: 9 _ 3 _ 5 _ 5 = 20 hard #4257: 9 _ 3 _ 6 _ 9 = 11 hard #4258: 9 _ 3 _ 6 _ 4 = 11 hard #4261: 9 _ 3 _ 6 _ 4 = 18 hard #4262: 9 _ 3 _ 6 _ 2 = -9 hard #4265: 9 _ 3 _ 7 _ 2 = 19 hard #4266: 9 _ 3 _ 7 _ 3 = 18 hard #4267: 9 _ 3 _ 7 _ 5 = 16 hard #4268: 9 _ 3 _ 7 _ 6 = 15 hard #4269: 9 _ 3 _ 7 _ 7 = 14 hard #4270: 9 _ 3 _ 7 _ 9 = 12 hard #4272: 9 _ 3 _ 8 _ 2 = 19 hard #4273: 9 _ 3 _ 8 _ 4 = 20 hard #4275: 9 _ 3 _ 8 _ 6 = 18 hard #4276: 9 _ 3 _ 8 _ 7 = 17 hard #4277: 9 _ 3 _ 8 _ 8 = 16 hard #4278: 9 _ 3 _ 8 _ 9 = 15 hard #4280: 9 _ 3 _ 9 _ 6 = 11 hard #4285: 9 _ 3 _ 9 _ 5 = 15 hard #4286: 9 _ 3 _ 9 _ 7 = 20 hard #4287: 9 _ 3 _ 9 _ 8 = 19 hard #4288: 9 _ 3 _ 9 _ 9 = 18 hard #4290: 9 _ 4 _ 2 _ 4 = 17 hard #4291: 9 _ 4 _ 2 _ 5 = 19 hard #4297: 9 _ 4 _ 2 _ 9 = -9 hard #4298: 9 _ 4 _ 2 _ 1 = 19 hard #4299: 9 _ 4 _ 2 _ 2 = 20 hard #4300: 9 _ 4 _ 2 _ 2 = 16 hard #4301: 9 _ 4 _ 2 _ 4 = 14 hard #4302: 9 _ 4 _ 2 _ 5 = 13 hard #4304: 9 _ 4 _ 2 _ 7 = 11 hard #4306: 9 _ 4 _ 3 _ 2 = 15 hard #4307: 9 _ 4 _ 3 _ 6 = 11 hard #4308: 9 _ 4 _ 3 _ 6 = 17 hard #4313: 9 _ 4 _ 3 _ 1 = 13 hard #4314: 9 _ 4 _ 3 _ 3 = 15 hard #4316: 9 _ 4 _ 3 _ 4 = 16 hard #4318: 9 _ 4 _ 3 _ 5 = 17 hard #4320: 9 _ 4 _ 3 _ 7 = 19 hard #4322: 9 _ 4 _ 3 _ 8 = 20 hard #4326: 9 _ 4 _ 4 _ 2 = 17 hard #4327: 9 _ 4 _ 4 _ 8 = 11 hard #4330: 9 _ 4 _ 5 _ 2 = 19 hard #4332: 9 _ 4 _ 6 _ 3 = 17 hard #4333: 9 _ 4 _ 6 _ 8 = 12 hard #4344: 9 _ 4 _ 6 _ 5 = 11 hard #4346: 9 _ 4 _ 6 _ 7 = 13 hard #4348: 9 _ 4 _ 6 _ 8 = 14 hard