tanX = (1/2.2)
    x=(1.0×14.3×900×0.062×925)/360
    tanX = 2.2
    x=1-√(1-2*0.06 )
    x=(656.4×10^6)/(1.0×14.3×900×925^2 )
    r=(1-r)^5
    r=(1-r)^4
    r=(1-r)^3
    x^3-7x-6
    x^4-7x-6=0
    -10x＋60x-8000＝750
    X^2-3x-4=0
    10000(0.25x+1) = x(x+1)(0.01x+1)(0.0025x+1)
    69.97-16.2732x-(21.1/2.9)x^2=0
    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

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