0.84*(1-0.25*t^2)= 1.25 t
    t^2*(t^2+1)*(0.25^2*t^2+1)= 25
    0.01t^4+t^2 = 40000
    0.01t^4+t^2=4000
    t^2+3t-2= 0
    0.25t^3+1.25t^2+t=100
    204081.6 = w^2(0.01w^2+1)
    7843 = w^2(0.01w^2+1)
    319554= w^2(0.01w^2+1)
    326530.6=w^2(0.01w^2+1)
    40000=w^2(0.01w^2+1)
    3.071w^4-165.65w^2=1
    1.5x＝10－x
    1 5x＝10－x
    12321w^2+900=w^2(1722w^2+1)（0.01w^2+1)(0.04w^2+1)
    0.019w^2+0.3w=0.97
    w^2(0.01w^2+1) (0.04w^2+1)=900
    x^2+2x>0
    x^2+x>0
    (x+1)(x-2)(x+3)>0

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