Hard Arithmetic Puzzles

#2561: 5 _ 9 _ 3 _ 4 = 11 hard #2567: 5 _ 9 _ 4 _ 3 = 17 hard #2568: 5 _ 9 _ 4 _ 6 = 11 hard #2569: 5 _ 9 _ 4 _ 3 = -7 hard #2571: 5 _ 9 _ 5 _ 3 = 20 hard #2572: 5 _ 9 _ 5 _ 2 = 18 hard #2574: 5 _ 9 _ 6 _ 4 = 11 hard #2575: 5 _ 9 _ 6 _ 8 = 17 hard #2577: 5 _ 9 _ 6 _ 8 = -7 hard #2578: 5 _ 9 _ 6 _ 2 = 15 hard #2580: 5 _ 9 _ 6 _ 6 = 20 hard #2581: 5 _ 9 _ 8 _ 6 = 17 hard #2582: 5 _ 9 _ 8 _ 6 = -7 hard #2594: 6 _ 2 _ 2 _ 8 = 19 hard #2601: 6 _ 2 _ 3 _ 9 = 12 hard #2614: 6 _ 2 _ 3 _ 9 = 13 hard #2616: 6 _ 2 _ 3 _ 5 = 18 hard #2638: 6 _ 2 _ 4 _ 9 = 12 hard #2641: 6 _ 2 _ 4 _ 4 = 19 hard #2646: 6 _ 2 _ 5 _ 2 = 17 hard #2647: 6 _ 2 _ 5 _ 4 = 19 hard #2648: 6 _ 2 _ 5 _ 5 = 20 hard #2662: 6 _ 2 _ 6 _ 8 = 16 hard #2667: 6 _ 2 _ 7 _ 2 = 19 hard #2668: 6 _ 2 _ 7 _ 4 = 17 hard #2669: 6 _ 2 _ 7 _ 6 = 15 hard #2671: 6 _ 2 _ 7 _ 9 = 12 hard #2672: 6 _ 2 _ 8 _ 2 = 16 hard #2673: 6 _ 2 _ 8 _ 4 = 14 hard #2674: 6 _ 2 _ 8 _ 8 = 13 hard #2678: 6 _ 2 _ 8 _ 2 = 19 hard #2679: 6 _ 2 _ 8 _ 5 = 19 hard #2681: 6 _ 2 _ 8 _ 7 = 17 hard #2682: 6 _ 2 _ 8 _ 8 = 16 hard #2683: 6 _ 2 _ 8 _ 9 = 15 hard #2684: 6 _ 2 _ 9 _ 3 = 12 hard #2686: 6 _ 2 _ 9 _ 9 = 13 hard #2687: 6 _ 2 _ 9 _ 9 = 11 hard #2690: 6 _ 2 _ 9 _ 8 = 19 hard #2691: 6 _ 2 _ 9 _ 9 = 18 hard #2694: 6 _ 3 _ 2 _ 2 = 19 hard #2695: 6 _ 3 _ 2 _ 2 = 17 hard #2704: 6 _ 3 _ 2 _ 8 = 17 hard #2706: 6 _ 3 _ 2 _ 9 = 18 hard #2711: 6 _ 3 _ 2 _ 5 = 20 hard #2714: 6 _ 3 _ 3 _ 3 = 19 hard #2715: 6 _ 3 _ 3 _ 3 = 17 hard #2718: 6 _ 3 _ 3 _ 6 = 20 hard