（x-30）[200-20（x-40）]=10000
    X^3-14X^2+17X＝196
    （5500-x）/（8250+x）＝1.5
    x^2-36x+320=0
    90-s+4s=9×15
    4x²+8x-6=0
    x^3-2x-5=0
    （1+x）^10=4
    （1+x）^10=3
    （1+x）^10=2
     100*(0.06039exp(-(0.06039*x))-0.006626exp(-(0.006626*x)) )
     100*(0.06062exp(-(0.06062*x))-0.006026exp(-(0.006026*x)))
     100*(0.05845exp(-(0.05845*x))-0.005865exp(-(0.005865*x)))
    100*(0.05883exp(-(0.05883*x))-0.006199exp(-(0.006199*x)))
    2x+x(x-1)/2=14
    2x+x(x-1)=14
    a+a/11.3=92800
    a+a*11.3=101300
    a+a/11.3=101300
    8X^3-135X^2-6X+2=0

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