arctan1
    （14.5+8.3+18.4+17.7+12.7+16.8+16.4+11.6+10.9+16.2+13.2+17.8+17+11.3+14.3+15.9+12.2+13+9.4+13+13.3）/21
    （14.5+8.3+18.4+17.7+10.5+12.7+16.8+11.8+16.4+11.6+11.1+10.9+16.2+13.2+17.8+17+15.3+11.3+14.3+15.9+12.2+13+9.4+13+13.3）/25
    （5.32+4.73+5.37+5.13+7.06+4.67+5.20+6.24+5.92+5.68+5.1+7.52+7.04+7.73+6.73+5.32+4.69+6.82+7.31+4.97+9.7+10.75+10+11+8）/25
    （5.32+4.73+5.37+5.13+4.67+5.20+5.92+5.68+7.52+7.04+7.73+6.73+5.32+6.82+7.31+4.97+9.7+10.75+10+11+8）/21
    arccos-0.6
    513239*9
    √13+2
    √13+2
    20000*2.5313+0.7722*5000=
    23723.9*[(tan(arccos0.75)-tan(arccos0.92)]
    tan(arccos0.75)-tan(arccos0.92)
    (2+2*3)^2-(2+3)*(2-3)
    20000*2.5313+5000*0.7722=
    20000*2.5313+0.7722*40000=
    1+1.05^2+1.05^3+1.05^4+1.05^5+1.05^6+1.05^7+1.05^8+1.05^9
    410.5/2
    577/2
    √36/289+81/16
    0.25*8*60*45*80/1000

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