Arithmetic Operator Puzzles

#3889: 8 _ 5 _ 4 _ 9 = 1 easy #3890: 8 _ 5 _ 6 _ 3 = 18 hard #3891: 8 _ 5 _ 6 _ 2 = -7 medium #3892: 8 _ 5 _ 6 _ 3 = -2 easy #3893: 8 _ 5 _ 6 _ 3 = 20 hard #3894: 8 _ 5 _ 8 _ 4 = 18 hard #3895: 8 _ 5 _ 8 _ 4 = -2 easy #3896: 8 _ 5 _ 8 _ 2 = 10 easy #3897: 8 _ 5 _ 8 _ 3 = 15 medium #3898: 8 _ 5 _ 8 _ 4 = 20 hard #3899: 8 _ 5 _ 9 _ 3 = -7 hard #3900: 8 _ 6 _ 2 _ 3 = 12 medium #3901: 8 _ 6 _ 2 _ 4 = 11 medium #3902: 8 _ 6 _ 2 _ 3 = 4 easy #3903: 8 _ 6 _ 2 _ 4 = 5 easy #3904: 8 _ 6 _ 2 _ 5 = -7 medium #3905: 8 _ 6 _ 2 _ 2 = 12 medium #3906: 8 _ 6 _ 2 _ 5 = 19 hard #3907: 8 _ 6 _ 2 _ 7 = 17 hard #3908: 8 _ 6 _ 2 _ 8 = 16 hard #3909: 8 _ 6 _ 2 _ 9 = 15 hard #3910: 8 _ 6 _ 2 _ 9 = 6 easy #3911: 8 _ 6 _ 3 _ 2 = 17 hard #3912: 8 _ 6 _ 3 _ 9 = 10 medium #3913: 8 _ 6 _ 3 _ 5 = 18 hard #3914: 8 _ 6 _ 3 _ 2 = -1 easy #3915: 8 _ 6 _ 3 _ 9 = 6 medium #3916: 8 _ 6 _ 3 _ 5 = -2 easy #3917: 8 _ 6 _ 3 _ 7 = -6 medium #3918: 8 _ 6 _ 3 _ 8 = -8 medium #3919: 8 _ 6 _ 3 _ 9 = 16 hard #3920: 8 _ 6 _ 3 _ 1 = 15 hard #3921: 8 _ 6 _ 3 _ 2 = 18 hard #3922: 8 _ 6 _ 3 _ 2 = 14 hard #3923: 8 _ 6 _ 3 _ 3 = 19 hard #3924: 8 _ 6 _ 3 _ 4 = 20 hard #3925: 8 _ 6 _ 3 _ 4 = 12 medium #3926: 8 _ 6 _ 3 _ 4 = 4 easy #3927: 8 _ 6 _ 3 _ 7 = 9 medium #3928: 8 _ 6 _ 3 _ 8 = 8 medium #3929: 8 _ 6 _ 3 _ 9 = 7 medium #3930: 8 _ 6 _ 3 _ 1 = 3 easy #3931: 8 _ 6 _ 3 _ 2 = 6 easy #3932: 8 _ 6 _ 3 _ 3 = 12 medium #3933: 8 _ 6 _ 3 _ 4 = 8 medium #3934: 8 _ 6 _ 3 _ 5 = 9 medium #3935: 8 _ 6 _ 3 _ 5 = 20 hard #3936: 8 _ 6 _ 3 _ 6 = -2 easy