Arithmetic Operator Puzzles

#2545: 5 _ 8 _ 7 _ 4 = 19 hard #2546: 5 _ 8 _ 7 _ 4 = -9 hard #2547: 5 _ 8 _ 9 _ 6 = 17 hard #2548: 5 _ 8 _ 9 _ 6 = -7 hard #2549: 5 _ 9 _ 2 _ 3 = 11 hard #2550: 5 _ 9 _ 2 _ 3 = -1 easy #2551: 5 _ 9 _ 2 _ 6 = 15 hard #2552: 5 _ 9 _ 3 _ 2 = 11 hard #2553: 5 _ 9 _ 3 _ 4 = 17 hard #2554: 5 _ 9 _ 3 _ 2 = -1 easy #2555: 5 _ 9 _ 3 _ 4 = -7 hard #2556: 5 _ 9 _ 3 _ 1 = 14 hard #2557: 5 _ 9 _ 3 _ 2 = 17 hard #2558: 5 _ 9 _ 3 _ 3 = 18 hard #2559: 5 _ 9 _ 3 _ 3 = 12 hard #2560: 5 _ 9 _ 3 _ 4 = 19 hard #2561: 5 _ 9 _ 3 _ 4 = 11 hard #2562: 5 _ 9 _ 3 _ 5 = 10 medium #2563: 5 _ 9 _ 3 _ 6 = 9 medium #2564: 5 _ 9 _ 3 _ 7 = 8 medium #2565: 5 _ 9 _ 3 _ 9 = 6 medium #2566: 5 _ 9 _ 3 _ 6 = 10 medium #2567: 5 _ 9 _ 4 _ 3 = 17 hard #2568: 5 _ 9 _ 4 _ 6 = 11 hard #2569: 5 _ 9 _ 4 _ 3 = -7 hard #2570: 5 _ 9 _ 4 _ 6 = -1 easy #2571: 5 _ 9 _ 5 _ 3 = 20 hard #2572: 5 _ 9 _ 5 _ 2 = 18 hard #2573: 5 _ 9 _ 5 _ 3 = 3 easy #2574: 5 _ 9 _ 6 _ 4 = 11 hard #2575: 5 _ 9 _ 6 _ 8 = 17 hard #2576: 5 _ 9 _ 6 _ 4 = -1 easy #2577: 5 _ 9 _ 6 _ 8 = -7 hard #2578: 5 _ 9 _ 6 _ 2 = 15 hard #2579: 5 _ 9 _ 6 _ 3 = 10 medium #2580: 5 _ 9 _ 6 _ 6 = 20 hard #2581: 5 _ 9 _ 8 _ 6 = 17 hard #2582: 5 _ 9 _ 8 _ 6 = -7 hard #2583: 6 _ 1 _ 2 _ 8 = 10 medium #2584: 6 _ 1 _ 2 _ 8 = 2 easy #2585: 6 _ 1 _ 3 _ 9 = 3 easy #2586: 6 _ 1 _ 4 _ 8 = 8 medium #2587: 6 _ 1 _ 4 _ 8 = 4 easy #2588: 6 _ 2 _ 2 _ 4 = 7 easy #2589: 6 _ 2 _ 2 _ 2 = 13 medium #2590: 6 _ 2 _ 2 _ 2 = 11 easy #2591: 6 _ 2 _ 2 _ 8 = 3 easy #2592: 6 _ 2 _ 2 _ 5 = 13 medium