400+19.6=((0.85+0.00003)x^2)/32+0.55xx
    400+19.6=((0.85+0.00003)x^2)/16+0.55xx
    400000+19.6=((0.85+0.00003)x^2)/16+0.55xx
    (55827-7500-X)*0.28=X
    400000+19.6=((0.85+0.00003)x^2)/32+0.55xx
    x^3-2x^2-3x+2=0
    400000+19.6=((0.85+0.00003)x^2)/32+((1.1x^2)/2)
    400+19.6=((0.85+0.00003)x^2)/32+((1.1x^2)/2)
    11.78x^3+94.32x^2+97.84x-1093.80=0
    400+19.6=(0.85+0.00003)x^2/32+1.1x^2/2
    400000+19.6=(0.85+0.00003)x^2/32+1.1x^2/2
    0.36*（k^0.4）=(0.02+0.1)k
    11.78x^3+99.60x^2+166.16x-696.82=0
    11.78x^3+122.54x^2+293.10x-495.18=0
    sin（970/（4πr））=460/r
    (x*(0.95*70+0.05*5)+(1-x)*0.8)*0.36+0.64=0.64+0.36*1.12/0.5
    x*(0.95*70+0.05*5)+(1-x)*0.8=5
    400/9.8+3-1=(((1+0.03*(20000/20))(10^4/20^4)+1+0.1)x^2)/(2*9.8)
    400000/9.8+3-1=(((1+0.03*(20000/20))(10^4/20^4)+1+0.1)x^2)/(2*9.8)
    50=sqrt(0.04*x^2+1)*sqrt(0.25*x^2+1)*sqrt(4*x^2+1)

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