101x45-45
101x93-93x1
125x88
3x25x2
169x53-69x53
45x98
99x(100+2)
102x76
用简便方法计算
小学4年级的知识
用递等式计算
追答101x45-45
=45x(101-1)
=45x100
=4500
101x93-93x1
=93x(101-1)
=93x100
=9300
125x88
=(125x8)x11
=1000x11
=11000
3x25x2
=3x(25x2)
=3x50
=150
169x53-69x53
=53x(169-69)
=53x100
=5300
45x98
=45x(100-2)
=4500-90
=4410
99x(100+2)
=(100-1)×102
=10200-102
=10098
102x76
=(100+2)x76
=7600+152
=7752