Question

计算75x189-89x73用简便方法计算

Answer 1

75x189-89x73
=75x200-75x11-73x100+73x11
=15000-825-7300+803
=7678

Answer 2

75×189-89×73

=（73+2）×189-89×73
=73×189-73×89+2×189
=73×（189-89）+2×（190-1）
=73×100+2×190-2
=7300+380-2
=7680-2
=7678