260*1.4-280*1.4
    sqrt54*sqrt0.5+sqrt12
    5.6*2
    5.6×2
    14.14*√((25+14.14^2)*(16^2+14.14^2))
    (0.004445×330)/18.4
    0.9×1×(18.4×π×600^2+330×50.27×10^2 )
    (600+1)/3000
    600+1/3000
    1.5*21/13*（-1）
    atan1244
    A(8,1) B(3,7,6)
    66790.229*0.14+984319.83
    66790.229*0.144+984319.83
    16*0.441*(e^(-0.882))*(0.441^2-1)-e^(-0.441)
    ln(-4918)
    0.528/0.94
    0.496/0.94
    0.55/0.9
    0.496/0.9

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