X+x*0.09=9000
    x+x*0.09=15
    x^-0.5=1.74-2lg(0.001-0.00003279x^-0.5)
    x^-0.5=1.74-2lg(2*0.0005-18.7*x^-0.5/359710)
    x^-0.5=1.74-2lg(0.001-0.00006559*x^-0.5)
    x^-0.5=2lg(179854*x^0.5)-0.8
    x^-0.5=1.74-2lg(0.001-18.7*x^-0.5/179854)
    x^4+(x^3+x)^2＝0.01
    x^4+（x^3+x）^2＝200
    x^4-（x^3+x）^2＝200
    x^2*（x^2+25）*（x^2+225 ）= 250*250
    x^4*（x^2+25）*（x^2+225） = 250
    x^-0.5=1.74-2lg(0.001-18.7*x^-0.5/359710)
    x=1.74-2lg(0.001-18.7x/359710)
    x=1.74-2lg(0.001-0.00005x)
    x+2lg（2-x）=8.34
    1400÷（1+X）^5=1050
    a*0.06328=cos(1/(a*3*5))
    a*0.06328=cos(1/(a*2*5))
    a*sina=0.628.3

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