90-2*arctan2
    12/(1.1)+12/(1.1)^2+12/(1.1)^3+12/(1.1)^4+12/(1.1)^5+12/(1.1)^6+12/(1.1)^7+12/(1.1)^8+12/(1.1)^9+12/(1.1)^10
     3(2)^3+3(2)^2-18(2)
    3(-3)^3+3(-3)^2-18(-3)
    (10^4)/12 + (10^3)/3-(7.5)10^2
    221.43/7500
    7500*(1+4%/12)^36/36
    7500^(4%*3)/36
    7500*e^(4%*3)/36
    （4500×12×0.9-60%×70X×6.95%）÷（40%×70X+5%×70X）=3.8%
    (5.56^2+64)/5.56/(5.56^2+1)
    (1.44^2+64)/(1.44*(1.44^2+1))
    1-1.1*e(-0.1)
    0.1-1+e(-0.1)
    180+arctan(17.86*0.56)-90-arctan0.56-arctan0.28-arctan(158.4*0.56)
    3.6x=78十X
    arctan0.886
    0.15*0.05+0.2*0.04+0.3*0.03+0.35*0.02
    arctan1.039
    1/3-1≦2

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