11.78x^3+62.16x^2-67.53x-2094.86=0
    3(x+3)≤3+2(2x-5)
    100000*(x*0.0001/(1.4128-x*0.0001))+500000*(x0.0001/(4.3250-x*0.0001))+200000*（x*10000/(14675.0000-x*10000))-34.19-76.25>=0
    11.78x^3+83.78x^2-38.8x-2187.98=0
    11.78x^3+89.05x^2+29.52x-1589.07=0
    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

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