(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)
    0.5*17^2+5*17+100
    !(47)
    0.85*42X+0.15*15X=32000*0.53
    0.85*42X+0.15*15X=17077
    0.85*42X+0.15*15X=17077*0.53
    0.85*42*450+0.15*15*450=
    0.85*42*450+0.15*20*450=
    0.85*42*450+0.15*20*450=33315*0.53

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