X*(X+1)*(25+X/20)=1050000
    25%=（X×2.5×1×0.4）/（1-X×2.5×1×0.4）
    x×x+50x-30000
    n(n+1)=1000
    1.427*2100+112.6=1.425*500+1.420*400+1.418*400+1.435*400+x*400
    x^2＋50x－275 = 0
    x2＋50x－275＝0
    50x/0.0568=21.6
    （2%-i）/-0.45=0.714285
    31536 = （480*81-x）*0.85+16*81
    21536=（480*81-x）*0.85+16*81
    157.66=（（0.021*x^1.85+239）^0.5）*x^0.84
    84.6=（（0.021*x^1.85+239）^0.5）*x^0.84
    62.04=（（0.021*x^1.85+239）^0.5）*x^0.84
    -2760x^2+1324.8x-46.9679=0
    3^2+（8-2a）^2=（8-a）^2
    -6831x^2+3278.88x-189.86=0
    8800+900x-2000x=0
    -240000=X-（0.42*X+404175）
    -24=X-（0.42*X+404175）

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