8.07*2.85
    ( (4780+870+896+299+12180*(1+20%+10.5%+111%+346.6%+24%)) *18%/21 25%+2117.07/2646.37)* (1+30%)
    1.2×10.77+0.5×10.77
    1.2×10.77+0.5×10.77
    35.83-53.25×2.04+1/2×12.93×〖2.04〗^2+1/2×20.41×1.45×（2.04-2/3×1.45）+1/2×12.93×（2.04-1.45）^2
    (2×53.25+20.41×1.45)/(2×（12.93+20.41） )
    =-26.31+57.29×1.27-1/2×12.93×〖1.27〗^2-1/2×20.41×1.45×（1.27-2/3×1.45）-1/2×12.93×（1.27-1.45）^2
    =-26.31+48.14×1.27-1/2×12.93×〖1.27〗^2-1/2×20.41×1.45×（1.27-2/3×1.45）-1/2×12.93×（1.27-1.45）^2
    (2×57.29-20.41×1.45)/(2×（12.93+20.41） )
    -26.31+51.52×1.10-1/2×12.93×〖1.10〗^2-1/2×20.41×1.45×（1-2/3×1.45）-1/2×12.93×（1.10-1.45）^2
    (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

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