400x*x+399x-1=0
    400x*x+399x-1=0
    3x=99998
    3x=99999
    X/(1+x^2)^1/2
    (1+x/12)^12-1=
    1-1/(1+(h/95/2)^2)^(3/2) = 1.496/2.755
    1-1/(1+(h/100.5/2)^2)^(3/2)=(3.341-2.755)/2.087
    （X+88）/（1-3%%）=972
    （X+88）/（1-3%%）=972
    5sinx+4=4cosx+1
    0= - 20 * ( sin ( x ) ) ^ 2 + 20 * ( cos ( x ) ) ^ 2 - 16 * sin ( x ) + 5 * cos ( x )
    e^x-1
    a²－147a+578＝0
    1.11＋x/3.85＋x=30%
    x^2-205x+10470=0
    x^2-140x+4090=0
    x^2+13600-255x=0
    x^2-85x+1650=0
    134（1+x）^10=1558

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