220×(1/√2)
    arctan 5/5
    (20-1)(20-2)/2
    3-7
    （68+51+5+79）/36.5=
    120.6*7.98/12.2=
    51*13.3/9+5*12.2/9=
    56*13.3/9=
    237-5-108-68=
    2-16
    （3-1）÷（3÷15-1÷10）
    (243.1-236.2)*(1380-1106)/(1400-1106)+236.2
    (243.1-236.2)*(1355.118-1106)/(1400-1106)+236.2
    (243.1-236.2)*(1346.588-1106)/(1400-1106)+236.2
    (243.1-236.2)*(1338.057-1106)/(1400-1106)+236.2
    (243.1-236.2)*(1320-1106)/(1400-1106)+236.2
    (243.1-236.2)*(1300-1106)/(1400-1106)+236.2
    (243.1-236.2)*(1288.058-1106)/(1400-1106)+236.2
    (243.1-236.2)*(1288.058-1106)/(1400-1106)+236.2
    (243.1-236.2)*(1275-1106)/(1400-1106)+236.2

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