36*125*15
=(4*9)*125*15
=(4*125)*(9*15)
=500*135
=67500
215*48+215*52
=215*(48+52)
=215*100=21500
69*102-2*69
=69*(102-2)
=69*100
=6900
32*110+15*32
=32*(110+15)
=(4*8)*125
=(8*125)*4
=4000
36*125*15
=(4*9)*125*15
=(4*125)*(9*15)
=500*135
=67500
215*48+215*52
=215*(48+52)
=215*100=21500
69*102-2*69
=69*(102-2)
=69*100
=6900
32*110+15*32
=32*(110+15)
=(4*8)*125
=(8*125)*4
=4000