sqrt(750^2+1000^2)
    364÷72
    242÷48
    140÷28
    ln(0.5)/[0.2ln(0.9)]
    ln(0.5)/0.2ln(0.9)
    cos4π
    0.2*ln(0.9)
    3/4-1/5+1/2-4/5
    0.9753^(800)
    2/sqrt(e)
    [(3.77%/1)+(3.77%/1.03)+(3.77%/(1.03)^2)+(3.77%/(1.03)^3)+(3.77%/(1.03)^4)+(1/(1.03)^4)]/(1.03)^(9/12)
    [(2.94%/1)+(2.94%/1.03)+(2.94%/(1.03)^2)+(2.94%/(1.03)^3)+(2.94%/(1.03)^4)+(1/(1.03)^4)]/(1.03)^(4/12)
    3.14/sqrt(5)
    e^(-2*sqrt(5)*3.14/5)
    （15060*15060+7320*7320+11400*11400）^0.5
    （9936*9936+11589*11589+14786*14786）^0.5
    (7/18)/(7/24)
    1/[(7/6)-(35/4)*(2/7)]+(7/18)/(7/24)
    1.8*1.02^(175)

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