用簡便方法計算(6+9+27+54+99)/3

用簡便方法計算(6+9+27+54+99)/3


(6+9+27+54+99)/3
=6/3+9/3+27/3+54/3+99/3
=2+3+9+18+33
=2+18+3+9+33
=20+12+33
=65



48*52*2-4*48用簡便方法


48*52*2-4*48
=48*(104-4)
=48*100
=4800