(2×51.52-20.41×1.45)/(2×（12.93+20.41） )
    -26.31+48.14×1-1/2×12.93×1^2-1/2×20.41×1.45×（1-2/3×1.45）-1/2×12.93×（1-1.45）^2=
    0.0036/ln(0.004/0.0003)
    -arctan2.8
    -arctan1.4
    -arctan19.74
    -arctan17.94
    -arctan(0.5*17.94)
    -3arctan1.23
    -3arctan1.23
    -arctan1.23
    -arctan1.23
    (16^(1/3)-1)^(1/2)
    －ln0.9
    √328
    √82
    2√164
    2√164
    2√164
    2√164

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