原式=40×46-2×46+108×20-108
=1840+2160-92-108
=4000-（92+108）=4000-200=3800
38X46+108X19
=19X2X46+108X19
=19X(2X46+108)
=19X200
=3800
38×46+108×19
=19×2×46+108×19
=19×(92+108)
=19×200
=3800
38×46+108×19
=38×46+54×2×19
=38×46+54×38
=38×(46+54)
=38×100
=3800
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024