（99/13440）*310=
    （120/13440）*310=
    （350/13440）*310=
    （450/13440）*310=
    （550/13440）*310=
    （1350/13440）*310=
    （1550/13440）*310=
    （850/13440）*310=
    25+100/9
    99*10=
    120*5=
    350*5=
    450*5=
    550*5
    1350*2
    e^(-0.0000000000234÷0.9÷3.86÷3.86)
    e^(0.0000000000234÷0.9÷3.86÷3.86)=
    0.75+1/4
    0.75+4/1
    365091.54/（1+6%）*6.72%=

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