Arithmetic Operator Puzzles

#817: 2 _ 6 _ 5 _ 5 = 11 easy #818: 2 _ 6 _ 5 _ 4 = 15 medium #819: 2 _ 6 _ 5 _ 3 = 5 easy #820: 2 _ 6 _ 6 _ 4 = 11 easy #821: 2 _ 6 _ 6 _ 9 = 6 medium #822: 2 _ 6 _ 6 _ 4 = -7 easy #823: 2 _ 6 _ 6 _ 9 = -2 medium #824: 2 _ 6 _ 6 _ 2 = 15 medium #825: 2 _ 6 _ 6 _ 6 = 13 medium #826: 2 _ 6 _ 6 _ 2 = 9 easy #827: 2 _ 6 _ 6 _ 6 = 11 easy #828: 2 _ 6 _ 6 _ 9 = 8 easy #829: 2 _ 6 _ 7 _ 7 = 13 medium #830: 2 _ 6 _ 7 _ 7 = 11 medium #831: 2 _ 6 _ 7 _ 6 = 14 medium #832: 2 _ 6 _ 8 _ 3 = 18 hard #833: 2 _ 6 _ 8 _ 4 = 5 easy #834: 2 _ 6 _ 8 _ 4 = -1 easy #835: 2 _ 6 _ 8 _ 2 = 16 hard #836: 2 _ 6 _ 8 _ 8 = 13 hard #837: 2 _ 6 _ 8 _ 2 = 8 medium #838: 2 _ 6 _ 8 _ 8 = 11 medium #839: 2 _ 6 _ 8 _ 2 = 3 easy #840: 2 _ 6 _ 8 _ 6 = 9 easy #841: 2 _ 6 _ 8 _ 3 = 8 easy #842: 2 _ 6 _ 9 _ 6 = 6 medium #843: 2 _ 6 _ 9 _ 6 = -2 medium #844: 2 _ 6 _ 9 _ 3 = 15 hard #845: 2 _ 6 _ 9 _ 9 = 13 hard #846: 2 _ 6 _ 9 _ 9 = 11 hard #847: 2 _ 6 _ 9 _ 6 = 8 easy #848: 2 _ 6 _ 9 _ 2 = 6 easy #849: 2 _ 6 _ 9 _ 3 = 1 easy #850: 2 _ 6 _ 9 _ 4 = 12 medium #851: 2 _ 6 _ 9 _ 5 = 15 hard #852: 2 _ 7 _ 2 _ 2 = 15 hard #853: 2 _ 7 _ 3 _ 6 = 16 hard #854: 2 _ 7 _ 3 _ 3 = 13 medium #855: 2 _ 7 _ 3 _ 6 = 7 easy #856: 2 _ 7 _ 4 _ 8 = 16 hard #857: 2 _ 7 _ 4 _ 4 = 15 hard #858: 2 _ 7 _ 4 _ 4 = 13 medium #859: 2 _ 7 _ 5 _ 5 = 15 hard #860: 2 _ 7 _ 5 _ 5 = 13 medium #861: 2 _ 7 _ 5 _ 7 = 10 easy #862: 2 _ 7 _ 6 _ 6 = 15 hard #863: 2 _ 7 _ 6 _ 2 = 11 medium #864: 2 _ 7 _ 6 _ 6 = 13 medium