2√2*(1-x)/{√x*[1+√(1-x)]}-tan(52.5) = 0
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(47.5) = 0
    （18+x）/（48+x）=2/5
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(42.5) = 0
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(37.5) = 0
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(35) = 0
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(32.5) = 0
    x²-0.71x+0.0169
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(30) = 0
    1175x²＋3268x－1800＝0
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(50) = 0
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(45) = 0
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(40) = 0
    2√2*(1-x)/{√x*[1+√(1-x)]}-tan(40)=0
    cos(x/2) = 4.5×π×x/1809.54
    abs(x^2-1)=(4-2*3^0.5)*(x+2)
    31x∧2-62x＋30＝0
    cos(x/2)=4.5×π×x/1809.54
    cos(x/2)=0.007812x
    X2+53.46x+265.4=0

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