Arithmetic Operator Puzzles

#673: 2 _ 4 _ 8 _ 6 = 5 easy #674: 2 _ 4 _ 8 _ 2 = 1 easy #675: 2 _ 4 _ 8 _ 6 = -1 easy #676: 2 _ 4 _ 8 _ 4 = 6 easy #677: 2 _ 4 _ 8 _ 1 = 2 easy #678: 2 _ 4 _ 8 _ 2 = -1 easy #679: 2 _ 4 _ 8 _ 3 = 4 easy #680: 2 _ 4 _ 8 _ 3 = -2 easy #681: 2 _ 4 _ 8 _ 4 = 5 easy #682: 2 _ 4 _ 8 _ 4 = -3 easy #683: 2 _ 4 _ 8 _ 5 = 6 easy #684: 2 _ 4 _ 8 _ 5 = -4 medium #685: 2 _ 4 _ 8 _ 6 = 7 easy #686: 2 _ 4 _ 8 _ 6 = -5 medium #687: 2 _ 4 _ 8 _ 7 = 8 medium #688: 2 _ 4 _ 8 _ 7 = -6 medium #689: 2 _ 4 _ 8 _ 8 = -7 medium #690: 2 _ 4 _ 8 _ 9 = 10 medium #691: 2 _ 4 _ 8 _ 9 = -8 hard #692: 2 _ 4 _ 8 _ 1 = 3 easy #693: 2 _ 4 _ 8 _ 2 = 6 easy #694: 2 _ 4 _ 8 _ 3 = 7 easy #695: 2 _ 4 _ 8 _ 3 = 12 medium #696: 2 _ 4 _ 8 _ 4 = 1 easy #697: 2 _ 4 _ 8 _ 5 = -1 easy #698: 2 _ 4 _ 8 _ 5 = 20 hard #699: 2 _ 4 _ 8 _ 6 = -2 easy #700: 2 _ 4 _ 8 _ 7 = 11 medium #701: 2 _ 4 _ 8 _ 8 = 12 medium #702: 2 _ 4 _ 8 _ 8 = -4 medium #703: 2 _ 4 _ 8 _ 9 = 13 hard #704: 2 _ 4 _ 8 _ 9 = -5 medium #705: 2 _ 4 _ 9 _ 2 = 20 hard #706: 2 _ 4 _ 9 _ 6 = 8 medium #707: 2 _ 4 _ 9 _ 6 = -4 medium #708: 2 _ 4 _ 9 _ 3 = 11 hard #709: 2 _ 4 _ 9 _ 9 = 9 medium #710: 2 _ 4 _ 9 _ 3 = 5 easy #711: 2 _ 4 _ 9 _ 6 = 12 medium #712: 2 _ 5 _ 2 _ 6 = 17 hard #713: 2 _ 5 _ 2 _ 4 = -8 easy #714: 2 _ 5 _ 2 _ 2 = 9 easy #715: 2 _ 5 _ 2 _ 4 = 20 medium #716: 2 _ 5 _ 3 _ 6 = 12 medium #717: 2 _ 5 _ 3 _ 9 = 17 hard #718: 2 _ 5 _ 3 _ 3 = 11 easy #719: 2 _ 5 _ 3 _ 3 = 9 easy #720: 2 _ 5 _ 3 _ 5 = 6 easy