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
    60.5%-（1+g/g）*3.15%=0
    -80+X-X*0.08/4=50
    -80+X-1*0.08/4=50
    50=-80+X-X0.8/4
    （1500－180）*120 (X－110 /2)+180*X^2/2=6.667*3345.87(1075－X)

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