3又3/4*1.25+37.5*0.975-375%,

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3又3/4*1.25+37.5*0.975-375%,

3又3/4*1.25+37.5*0.975-375%,
3又3/4*1.25+37.5*0.975-375%,

3又3/4*1.25+37.5*0.975-375%,
3又3/4*1.25+37.5*0.975-375%
=3.75×1.25+3.75×9.75-3.75
=3.75×(1.25+9.75-1)
=3.75×10
=37.5