65000*(1+(1+0.5%)^120)/((1+0.5%)^120-1)
    -0.1X=-30
    x^3-5x^2+6x-1=0
    （95.3*105000+21*213000+19.4*419000+18.5*754000)/(74.8*105000+43.5*213000+22.6*19000+10.4*754000)
    x/x-1-3/(x-1)(x+2)＝1
    5^(2)-2x-30＝0
    5x2-2x-30＝0
    -s^2+216s+636 = 0
    x-（x*0.62）=20
    -s^2+216s+636=0
    (98822.71-x)1.04+x=102397.305
    x2+x=6
    3s^3+12s^2+14s+8=0
    x/(1-x)=3.387188
    k^0.6=0.4/0.15
    5X^(2)＋7X＝0
    3x＾2+8x+5=0
    3x＾2+8x+3=0
    3x＾2+8x+1=-2
    8x+6（25-x）=170

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