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    1/5.3*(1/5.3)
    1/5.3*1/5.3
    1+1/5.3+1/5.3
    508÷(1+0.189)*0.189
    357/917 249/718
    357/917 165/870 180/591 249/718
    22815/4161 3390/718 3662/552 12214/1681
    361/46 802/75 830/48 375/89
    24379/4571 48710/5792 22800/4661 44900/7177
    3562/2.55÷28
    4325÷(8627/23%)
    2397/4973×[(1+1.19)/(1+0.86)]
    7927/(40108+3079)
    √2.89
    √289
    -6.067*10^(-3)*2.71828182845904523536^(-0.221*0.309)*sin(4.945*0.309)
    -2/4+13/4+11/4-30/4
    (19.0×1.5+2.0×18.2+6.0×17.6+1.7×19.7+14.0×18.0)/25.2=
    5187.34×5.93+205.53×26.5+435.25×21.5+5.82×16.89-1.25(14.66×27.04+86.73×25.39+441.54×20.98+217.95×17.62+4135.91×7.17)=
    tan4.712389

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