Hard Arithmetic Puzzles

#4559: 9 _ 8 _ 6 _ 5 = 17 hard #4562: 9 _ 8 _ 6 _ 7 = 19 hard #4564: 9 _ 8 _ 6 _ 8 = 20 hard #4568: 9 _ 8 _ 8 _ 4 = -7 hard #4569: 9 _ 8 _ 9 _ 4 = -9 hard #4571: 9 _ 8 _ 9 _ 2 = 16 hard #4574: 9 _ 9 _ 2 _ 3 = 15 hard #4576: 9 _ 9 _ 2 _ 4 = -9 hard #4579: 9 _ 9 _ 2 _ 6 = 13 hard #4580: 9 _ 9 _ 2 _ 7 = 15 hard #4581: 9 _ 9 _ 2 _ 8 = 17 hard #4582: 9 _ 9 _ 2 _ 9 = 19 hard #4583: 9 _ 9 _ 2 _ 4 = -7 hard #4584: 9 _ 9 _ 2 _ 5 = -9 hard #4587: 9 _ 9 _ 3 _ 2 = 15 hard #4591: 9 _ 9 _ 3 _ 7 = 20 hard #4592: 9 _ 9 _ 3 _ 8 = 19 hard #4593: 9 _ 9 _ 3 _ 9 = 18 hard #4595: 9 _ 9 _ 3 _ 4 = 13 hard #4596: 9 _ 9 _ 3 _ 6 = 19 hard #4597: 9 _ 9 _ 3 _ 3 = -8 hard #4599: 9 _ 9 _ 4 _ 6 = 15 hard #4600: 9 _ 9 _ 4 _ 2 = -9 hard #4602: 9 _ 9 _ 4 _ 8 = -9 hard #4604: 9 _ 9 _ 4 _ 3 = 13 hard #4605: 9 _ 9 _ 4 _ 2 = -7 hard #4608: 9 _ 9 _ 5 _ 2 = -9 hard #4609: 9 _ 9 _ 6 _ 4 = 15 hard #4611: 9 _ 9 _ 6 _ 2 = 13 hard #4612: 9 _ 9 _ 6 _ 3 = 19 hard #4613: 9 _ 9 _ 7 _ 2 = 15 hard #4614: 9 _ 9 _ 8 _ 4 = -9 hard #4616: 9 _ 9 _ 8 _ 2 = 17 hard #4617: 9 _ 9 _ 9 _ 2 = 19 hard