（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%=
    0.5*π-arctan0.859-arctan0.4295
    0.5π-arctan0.859-arctan0.4295
    (12)e3*e4+432
    (12)3*64+432
    A(7,3)*(sqrt(140+2^3-2*2*2^2+12)-abs(87-9*2^0)+!(3))/C(5,2)-lg(100)*(ln(e^13)-sin105+cos45)/tan60
    π/e 7/2e

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