9减去5
    19%8
    7%6
    -20/9
    12.333除3
    5/3*(-4/3)
    12.333乘3
    12.333乘以3
    5/3*(-1/3)-5/3
    (e^(14.09*0.09)-e^(-14.09*0.09))/((e^(14.09*0.09)+e^(-14.09*0.09))/2)
    28*0.076*-510/14.09
    ((e^(-14.09*0.045)+e^(14.09*0.045))/2)/((e^(-0.09*14.09)+e^(0.09*14.09))/2)
    (e^(-14.09*0.045)+e^(14.09*0.045))/2
    sqrt(-ln(138.99/1120)(740^2))
    (28*0.076/(55*1.95*10^(-4)))^0.5
    21+12.2*16.15
    19.1/15.4
    15.4*19.1
    (90.98-87.1)/(91.4-87.1)
    12.554-0.646

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