｛1-328÷（328×2.5）｝÷2.4=(1-328÷328÷2.5)÷2.4=(1-2/5)×4/9=3/5×4/9=4/151又1/4×17.6+36÷4/5+1.25=5/4×17.6+36×5/4+5/4=5/4×(17.6+36+1)=5/4×54.6=68.25201.2×22/25+2012×3/200-20.12×3/10=201.2...