（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
    (e^（1.501）-e^（-1.501）)/(e^（1.501）+e^（-1.501）)
    （(e^（0.4997）-e^（-0.4997）)/(e^（0.4997）+e^（-0.4997）)）/0.4997
    (e^（0.4997）-e^（-0.4997）)/(e^（0.4997）+e^（-0.4997）)
    th(0.4997）/0.4997
    36+9+9+6*16
    （x-12-32）0.7/40 = （x-6-24）0.7/60
    （x-12-32）0.7/40=（x-6-24）*0.7/60
    (8.82*10^6)/(4.2*10^7*0.42)
    (x-20-1)(40-2x)=300

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