8888008x125=8888008*1000/8=11110010000
(9991x1999.1999+9991.9991x1999)/2.0002=(9991x1999*1.00001+1999*9991*1.00001)/2.0002=9991*1999*1.00001*2/2.00002=9991*1999=(10000-9)*1999=19990000-9*(2000-1)=19990000-18000+9=19972009
8888008x125=8888008*1000/8=11110010000
(9991x1999.1999+9991.9991x1999)/2.0002=(9991x1999*1.00001+1999*9991*1.00001)/2.0002=9991*1999*1.00001*2/2.00002=9991*1999=(10000-9)*1999=19990000-9*(2000-1)=19990000-18000+9=19972009