作业帮(-421)×(-1/4)-0.25×(-7 1/2)-28.5×25%
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(-421)×(-1/4)-0.25×(-7 1/2)-28.5×25%
(-421)×(-1/4)-0.25×(-7 1/2)-28.5×25%
(-421)×(-1/4)-0.25×(-7 1/2)-28.5×25%
(-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