9.9X9.81
=(10-0.1)X9.81
=10X9.81-0.1x9.81
=98.1-0.981
=97.119
9.9*9.81=10*9.81-0.1*9.81=98.1-0.981=97.119
0
9.9X9.81
=(10-0.1)X9.81
=10X9.81-0.1x9.81
=98.1-0.981
=97.119
9.9*9.81=10*9.81-0.1*9.81=98.1-0.981=97.119