b^3-12b^2+54b-129=0
    a^3-6a^2+18a+21=0
    26.6＝22.93x-14.196
    38800/12000=(（1+x）^20-1)/x
    15.1/8.8=n^15
    15.1/8.5=n^15
    142385*(1+0.015)^x=156435*(1+0.01)^x
    5x=2
    86242n^15=151000
    8.505*n^15=15.1
    377500/250000=n^15
    15.745=（（0.021*x^1.85+2293）^0.5）*x^0.84
    4[20（t+2）+30t]+25*3t+30*3t+(t+2+0.75）*6*20=500t+400
    X/（X+500）=49%
    x*x+x=36
    22.09/x = 2/3*((1-1/0.5)+(3/4+1/0.5)*(1/3*333.8/x*0.35805183739485175）^0.5)
    13.38/x = 2/3*((1-1/0.5)+(3/4+1/0.5)*(1/3*290/x*0.35805183739485175）^0.5)
    9.67/x = 2/3*((1-1/0.5)+(3/4+1/0.5)*(1/3*230.3/x*0.35805183739485175）^0.5)
    14.46/x = 2/3*((1-1/0.5)+(3/4+1/0.5)*(1/3*285.8/x*0.35805183739485175）^0.5)
    15.6/x = 2/3*((1-1/0.5)+(3/4+1/0.5)*(1/3*289.1/x*0.35805183739485175）^0.5)

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