Matchstick Puzzles

#673: Fix 0+1=8 medium #674: Fix 7+6=15 medium #675: Fix 6+3=17 medium #676: Fix 5-8=14 hard #677: Fix 0+7=13 medium #678: Fix 9-9=78 hard #679: Fix 7-6=73 hard #680: Fix 2-8=2 hard #681: Fix 1-1=9 easy #682: Fix 1-7=6 medium #683: Fix 8-2=70 hard #684: Fix 4+2=9 easy #685: Fix 9-2=4 easy #686: Fix 4-8=13 hard #687: Fix 9-5=6 easy #688: Fix 2+3=6 easy #689: Fix 2+3=3 easy #690: Fix 5+0=8 medium #691: Fix 5+1=4 easy #692: Fix 8-0=9 hard #693: Fix 4+6=13 medium #694: Fix 0-7=1 medium #695: Fix 2+1=5 easy #696: Fix 6+3=12 medium #697: Fix 3+6=8 easy #698: Fix 5+7=73 hard #699: Fix 8+9=71 hard #700: Fix 2-2=6 easy #701: Fix 6+8=18 medium #702: Fix 7+6=7 easy #703: Fix 2+9=70 hard #704: Fix 3+5=6 easy #705: Fix 6+8=0 hard #706: Fix 7+6=12 medium #707: Fix 8-2=5 easy #708: Fix 7-5=72 hard #709: Fix 6+0=15 medium #710: Fix 5+5=16 medium #711: Fix 2+9=12 medium #712: Fix 8-6=74 hard #713: Fix 6+0=12 medium #714: Fix 2+0=18 medium #715: Fix 7+9=19 medium #716: Fix 7+9=10 easy #717: Fix 4-8=10 hard #718: Fix 3-8=17 hard #719: Fix 9+8=19 medium #720: Fix 7-7=74 hard