n×（n－1）÷5×（3÷n）^（n－5）
    a²＋a＝5
    y-89.1=y*0.1
    0.04x=60
    x²+2x-0.14=0
    x+0.5x=230
    x+x/2=230
    a^2+3a-9=0
    0.0148/x＝0.1289/0.86289
    0.4/100.58＝x/3.722
    12.09c=（3.3+c）×8.97
    （x-40)[100-2(x-50)]=1750
    x^2-500x+4875=0
    [(0+a+843+8000)-5000-843]*3%=0+a
     [(0+a+10000)-5000]*3%=0+a
    0=314.8530-0.4173y-0.0076y^2
    0=314.8530+1.7696x-0.0870x^2
    0=314.8530-0.4173y-0.0076y2
    0=314.8530+1.7696*0-0.4173y-0.0870*0-0.0076y2
    0.126785/x＝0.1289/0.86289

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