1.2=0.72/(1+r)+0.72/(1+r)^2
    -1.2=0.72/(1+r)+0.72/(1+r)^2
    800=1000/（1+r）^10+100*(1-1/(1+r)^10)/r
    cos2
    X-X*10%=14000
    800=1000/（1+r）^10+100*(1-1/(1+r)*10)/r
    cos1.5
    12x(x+0.375)=8
    (6*4){2[3(4+2)]-2(3-1)}
    19+105.42x>16.5+125x
    cos1
    sin1
    sin1.5
    100=95.23*e^(-x)+89.84*e^(-2x)+84.56*e^(-3x)
    (x+2.5)/ln((40.5+2.5)/(40.5-X))=31.388
    18.7+105.42x>17+125x
    (x+2.5)/ln((40.5+2.5)/(40.5-X)) =
    (x+2.5)/ln((40.5+2.5)/(40.5-X)) =33.447
    (x+2.5)/ln((40.5+2.5)/(40.5-X)) =35.369
    (x+2.5)/ln((40.5+2.5)/(40.5-X)) =37.859

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