(-421)×(-1/4)-0.25×(-7 1/2)-28.5×25%

来源：学生作业帮助网编辑：作业帮时间：2024/06/04 05:38:21

(-421)×(-1/4)-0.25×(-7 1/2)-28.5×25%
=421x0.25+7.5x0.25-28.5x0.25
=(421+7.5-28.5)x0.25
=400x0.25
=100