简便方法计算 1.625+2.625+3.625+······+79.625+80.625简便方法计算以下各题:752*1.25+4.45*12.5+0.035*1250.4*160+36*1.6-31*3.21.625+2.625+3.625+······+79.625+80.625(写出过程)

问题描述:

简便方法计算 1.625+2.625+3.625+······+79.625+80.625
简便方法计算以下各题:752*1.25+4.45*12.5+0.035*125
0.4*160+36*1.6-31*3.2
1.625+2.625+3.625+······+79.625+80.625(写出过程)