81*27+19*25
=81*（25+2）+19*25
=81*25+81*2+19*25
=（81*25+19*25）+162
=25*（81+19）+162
=25*100+162
=2500+162
=2662
81×27+19×25
=81×(2+25)+19×25
=81×2+81×25+19×25
=162+(81+19)×25
=162+100×25
=162+2500
=2662
原式=81x(25+2)+19x25
=81x25+19x25+81x2
=(81+19)x25+162
=100x25+162
=2500+162
=2662
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024