5*1/(1+r)+5*1/(1+r)*1/(1+r)+5*1/(1+r)*1/(1+r)*1/(1+r)+5*1/(1+r)*1/(1+r)*1/(1+r)*1/(1+r)=102.78
    5*（1+r）-1
    -2xxx-30xx-300x+2000
    2xxx-15xx-410x+50
    x（x＋1）＝1
    x2+12x+25=0
    2x^2+3x-2
    (x^2+0.272^2-0.167^2)/2*x*0.272=cos63.45
    (x^2+0.272^2-0.167^2)/2*x*0.272=cos126.9
    (x^2+0.272^2-0.167^2)/2*x*0.272
    (9.8*x^2)/2=685
    2832.6=16700*（0.92x-(x^2)/2)
    (2.3*x^2)/2=555
    (5x*5)+5=120
    X-10=X/2
    X×0=X/0
    10-X=6
    X×0=0/X
    -(x+5)*(x+1)^2-4*(x+1)
    -(x+5)*(x+1)^2-4*(x+1)=0

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