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
    -3/2x＝3
    -1/2x-x
    x/20+x/30+x/42=3
    x/20+x/30+x/42=3x
    tanx=x
    998.56=(1+0.25x^2)×(1+0.04x^2)
    1000=(1+0.25x^2)×(1+0.04x^2)
    2*sqrt（2）*sqrt（（2.5-x）*（2.5-x）+2）*(3-x)=sqrt（（2.5-x）*（2.5-x）+2）+3-x-1.5

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