40乘13乘25
=40*25*13
=1000*13
=13000
480除以32
=16*30/16*2
=30/2
=15
120除以5除以4
=120/（5*4）
=120/20
=6
38乘201
=38*（200+1）
=38*200+38*1
=7600+38
=7638
45乘97-7乘45
=45（97-7）
=45*90
=45*（100-10）
=45*100-45*10
=4500-450
=4050
21乘41減21
=21（41-1）
=21*40
=840
35乘22加35乘36+35乘22
=35(22+36+22)
=35*80
=2800
44乘198
=44*(200-2)
=44*200-44*2
=8800-88
=8712
125乘25乘8乘40
=125*8*25*4
=1000*100
=100000
95乘53加53
=53(95+1)
=53*96
=53*(100-4)
=53*100-53*4
=5300-212
=5088
99乘125
=(100-1)*125
=125*100-125*1
=12500-125
=12375
45乘101減45
=45(101-1)
=45*100
=4500