r^3=54r-135
    4S^3+0.04S^2=5.61*10^-12
    x+（1000+x*576）/2080=29
    [(220+260+220)*21-x]*0.85+(8+8)*21=(220+220+260)*21*0.85+8*21
    [（220+220+260）*21-x]*0.85=（220+220+260）*21*0.85
    X-X*0.065-(X+1500000)*0.0003=1500000
    X-X*0.065-(X+1500000)*0.0003 = 1500000
    X-X*0.065-(X+1500000)*0.0003=1500000
    X-X*0.065-X*0.35-(X+1500000)*0.0003=1500000
    1.0×14.3×600×258.5+1.0×14.3（600-250）×120=360×X
    0.086=（（0.021*x^1.85+4.7）^0.5）*x^0.84
    16.47=（（0.021*x^1.85+4.7）^0.5）*x^0.84
    0.395=（（0.021*x^1.85+4.7）^0.5）*x^0.84
    0.01x^4+x^2=40000
    2.867=（（0.021*x^1.85+4.7）^0.5）*x^0.84
    1.0×14.3×600×258.5+1.0×14.3（600-250）×120=360X
    540540000=1.0×14.3×250X(585-1/2×X)+1.0×14.3（600-250）×120（585-60）
    (x-1.249)*1000-0.1=4
    8x²+3x-45＝0
    0.54=0.0295*lg（x/（0.05-x））-0.059*lg（（0.05-2x）/2x）

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