Arithmetic Operator Puzzles

#529: 2 _ 2 _ 4 _ 6 = -5 easy #530: 2 _ 2 _ 4 _ 7 = 8 easy #531: 2 _ 2 _ 4 _ 7 = -6 medium #532: 2 _ 2 _ 4 _ 8 = 9 medium #533: 2 _ 2 _ 4 _ 8 = -7 medium #534: 2 _ 2 _ 4 _ 9 = 10 medium #535: 2 _ 2 _ 4 _ 9 = -8 hard #536: 2 _ 2 _ 4 _ 2 = 9 easy #537: 2 _ 2 _ 4 _ 4 = 17 medium #538: 2 _ 2 _ 4 _ 2 = -7 easy #539: 2 _ 2 _ 5 _ 3 = 16 medium #540: 2 _ 2 _ 5 _ 2 = -9 easy #541: 2 _ 2 _ 6 _ 4 = 5 easy #542: 2 _ 2 _ 6 _ 3 = 8 easy #543: 2 _ 2 _ 6 _ 9 = 6 easy #544: 2 _ 2 _ 6 _ 2 = 13 medium #545: 2 _ 2 _ 6 _ 3 = 19 hard #546: 2 _ 2 _ 7 _ 2 = 15 hard #547: 2 _ 2 _ 8 _ 4 = 1 easy #548: 2 _ 2 _ 8 _ 2 = 1 easy #549: 2 _ 2 _ 8 _ 2 = 17 hard #550: 2 _ 2 _ 9 _ 3 = 8 medium #551: 2 _ 2 _ 9 _ 6 = 5 easy #552: 2 _ 2 _ 9 _ 3 = -4 medium #553: 2 _ 2 _ 9 _ 6 = -1 easy #554: 2 _ 2 _ 9 _ 6 = 6 easy #555: 2 _ 2 _ 9 _ 2 = 19 hard #556: 2 _ 3 _ 2 _ 8 = 14 hard #557: 2 _ 3 _ 2 _ 4 = -4 easy #558: 2 _ 3 _ 2 _ 2 = 7 easy #559: 2 _ 3 _ 2 _ 6 = 8 easy #560: 2 _ 3 _ 3 _ 9 = 3 easy #561: 2 _ 3 _ 3 _ 3 = 7 easy #562: 2 _ 3 _ 4 _ 8 = 8 medium #563: 2 _ 3 _ 4 _ 2 = -4 easy #564: 2 _ 3 _ 4 _ 8 = -4 medium #565: 2 _ 3 _ 4 _ 8 = 12 medium #566: 2 _ 3 _ 5 _ 5 = 7 easy #567: 2 _ 3 _ 5 _ 6 = 20 hard #568: 2 _ 3 _ 6 _ 8 = 6 easy #569: 2 _ 3 _ 6 _ 8 = -2 easy #570: 2 _ 3 _ 6 _ 1 = 2 easy #571: 2 _ 3 _ 6 _ 2 = -1 easy #572: 2 _ 3 _ 6 _ 3 = -2 easy #573: 2 _ 3 _ 6 _ 4 = 5 easy #574: 2 _ 3 _ 6 _ 5 = -4 easy #575: 2 _ 3 _ 6 _ 6 = -5 easy #576: 2 _ 3 _ 6 _ 7 = 8 easy