（3y－1）∧2
    3.75*（t0-41）=(58-t0)
    3.75*1
    1600+4*4*159
    1600-4*4*159
    (470-22）* (1-25%)-238* (1-25%)+(60+62.5)*25%
    (390-22）* (1-25%)-206* (1-25%)+(60+62.5)*25%
    (390-20）* (1-25%)-206* (1-25%)+(60+62.5)*25%
    (390-20）* (1-25%)-194* (1-25%)+(60+62.5)*25%
    (360-20）* (1-25%)-194* (1-25%)+(60+62.5)*25%
    71183
    2+2+2+34 years
    （5500*12*0.9-0.7*145x*0.064）/（0.3*145x+0.05*145x）=0.038
    X*0.3+2*x=2
    6.75÷0.25
    0.52*9.8*0.31*3.6/2
    0.52*9.8*0.3*3.6/2
    0.5sqrt(212.5)+0.5sqrt(12.5)
    225*0.5+15*5+100
    0.5sqrt(-0.5*17^2+25*17-100)+0.5sqrt(-0.5*17^2+15*17-100)

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