7.683×190－768.3×0.8－76.83

7.683×190－768.3×0.8－76.83
=76.83×19－76.83×8－76.83
=76.83×(19-8-1)
=76.83×10
=768.3
1999又9分之8＋2000又9分之8＋2001又9分之8＋9分之4
=2000-1/9+2001-1/9+2002-1/9+4/9
=6003-3/9+4/9
=6003又1/9
1又2/3×1又2/5×1又2/7×1又2/9×1又2/11×.×1又2/199
=5/3×7/5×...×199/197×201/199
=201/3
=67

7.683 x 190 - 768.3 x 0.8 - 76.83
= 768.3 x 1.9 - 768.3 x 0.8 - 768.3 x 0.1
= 768.3 x (1.9 - 0.8 - 0.1 )
=768.3

768.3
6003又9分之1
67

、嗯