-X^2-10xX+200
    15x^2+2x-4=0
    15 ^2+（ 20-x）^2= （ 20-x）^2
    x*x+x-2
    x*x+x+2=0
    （80+x）(53-x)=51*80
    2x（30-2x）+2x（20-2x)=200
     x/sin(x/2) = 4.1887
    x/sin(x/2)=4.1887
    (4x-16)/(4*sqrt(2)*sqrt(16+(x-4)^2))=3*sqrt(2)/10
    4x-16=12*sqrt(16+(4-x)^2)/5
    13.675+sqrt（1.7x/2/3.1415926-187.005625）=13.525+sqrt(1.7x/2/3.1415926-182.925625)
    13.675-sqrt（1.7x/2/3.1415926-187.005625）=13.525-sqrt(1.7x/2/3.1415926-182.925625)
    256（1+x）²=400
    -x^1+36x-320=0
    x^6+2*x^5-2*x^3-4=0
    x²-256x=256(576-x)
    x+x*0.05=3500
    -2/1x-x＝3
    -2/1x-x

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