700000*（1+r）^(-5)=397200
    1.3483-1.3585=0.0712x
    (0.7+x)(0.4+x)=0.15
    75%x-25%x=10
    (1-x)(1-x-0.3)=0.15
    -x^2+300x-6400
    100x*x-170x+55=0
    0.8-x=2.5x／（1+1.5x）
    5/8 x+2/3(100-x)=64
    32v^2+12*18v-17*900=0
    x^2-0.04x-0.08=0
    x/（1+x）=0.4
    101.25x=306.25+35x+x2
    100/(1.065+x)+100/(1.055+x)=88.58*1.06*2
    -0.5x^2-x+1=0
    ln[(0.15-x)/(0.11-x)=0.28/(0.2-x)
    (130*0.508+x) /(130+x) =0.6
    45*t^(1/2)*cos(0.063*t^2)=60
    17x*2-78x-15=0
    3（X-2）-12(X-2)+(X+1)((X-3)(X-2)+4(X-2))=0

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