10000*(x/4+1) = x*(x+1)*(x/100+1)*(x/400+1)
    840x∧2+x∧4＝117625
    (99*(Z^2)-2*99*Z+99)/90+(9Z+Z^2)=0
    20lgx=-5.88
    (99*Z^2-2*99*Z*99)/90+(9Z+Z^2)=0
    (3*x^2)/40 - 1 - x^2 - (x^2)/200 + (x^4)/200=0
    -0.5xx+50x=1050
    arctan(0.5x)-90-arctan(x)-arctan(x/10)-arctan(x/20)=-180
    arctanx=45
    1+10/(Z-1)+(10*Z-10)/(9*Z-0.0004086)-(Z-1)/(90*Z)=0
    1332.909443*(1-(1+r)^-10)=10000r
    2/3*(3+√17)^2/4+2(3+√17)-1/3(3+√17)^3/8
    2409.75*(1-(1+r)^-5)=10000r
    （1-x）（4-x）（5-x）+4+x=0
    lgx=0.2
    30*140*0.004492/0.800817
    1-0.199183145293404
    (1/1.004492)^360
    1/（x-6）-4=1/（x+6）+3
    -5x3+9x2+16x-28=0

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