40lg5-60lg(3/2)
    log（4,27）
    A(1,1) B(0,0)
    (1,1) (0,0)
    1-sin25
    30/31+0.4
    25/48×0.4×1.2
    360-33.56
    arctan(2.11/-3.18)
    (3.18^2+2.11^2)^0.5
    -5*0.3*sin240-40/3*0.2*sin300-10*0.3*sin30
    -5*0.3*cos240-40/3*0.2*cos300-10*0.3*cos30
    arctan(0.28/2.83)
    (2.83^2+0.28^2)^0.5
    -10*0.4*sin120-10*0.3*sin240-20/3*0.2*sin300
    -10*0.4*cos120-10*0.3*cos240-20/3*0.2*cos300
    900*101.8/((3.1415926)^2*620^2*0.01)
    0.5*(200-116.67)*((104.16-14.58+30)*3.1415926/180)+0.5*116.67*14.58*3.1415926/180
    0.5*(200-116.67)*((104.16-14.58)*3.1415926/180)+0.5*116.67*14.58*3.1415926/180
    116.67/8

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