0.5+0.6x=4.7
    x*x-16970x+23000
    [8%*100/55*(1-x)]/[1-8%*100/55*(1-x)]=10%
    10%=[8%*100/55*(1-x)]/1-[8%*100/55*(1-x)]
    10x-5.4x=23
    10x-5.4x=
    (x+2400)-97%x=6000
    0.2812-0.0592/2*lg（x/0.79）=0.568
    1.12^x=1
    1.12^x=1
    83.2+（17－x）*4.32＝（50+84+6.48x）/1.5
    126.4+（21－x）*4.3＝（50+84+6.5x）/1.5
    19.2063=(1+g/g)
    x^1/2
    60.5%*g=(1+g)*3.15%
    60.5%-(1+g/g)*3.15%=0
    10-2x = 0
    10-2x=6
    （66.67%-6.17%）-（1+x/x）*4.5%*70% = 0
    （66.67%-6.17%）-（1+g/g）*4.5%*70%=0

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