(x+1)(1-x)=6.09
    20*lg(40/( x * ((0.04*(4.74)^2 + 1) * ((0.0625 * 4.74)^2 + 1)))) = x
    X+(60-X)=60
    x^2+63x—1=0
    -0.2t^3+5.13t^2-500=0
    -t^3+15t^2-500=0
    90 - arctan(0.2*x) - arctan(0.0625*x) = 30
    arctan(0.0625*12.14) = x
    2^x=0.001
    1*s^2+2*s+2 = 0
    arctan(0.2*12.14) = x
    arctan(0.2*12.14)=x
    1600 = x^2((0.04x^2+1)((0.0625x)^2 + 1))
    49x^2+889x+904=0
    3x*x-2*x-2=0
    103=8/x[1-1/(1+x)^5]+100/(1+x)^5
    625-（25x-19）^2=819x^2
    4:5x=1.2:25%
    [abs(x-112.5)-0.5]^2/112.5+[abs(150-x-37.5)-0.5]^2/37.5=0.00392
    0.98=x/78.11/（（x/78.11+（1-x）/92.13））

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