30X=（6/11）
    X=30÷（6/11）
    12X=0.25
    （220*63-X）*0.95+8*63=12285
    2/3*((1-1/0.2)+(3/4+1/0.2)*(1/3*172/x*0.35805183739485175)^0.2)=4.7843137254902/x
    2/3*((1-1/0.13)+(3/4+1/0.13)*(1/3*172/x*0.35805183739485175)^0.13)=4.7843137254902/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*172/x*0.35805183739485175)^0.07)=4.7843137254902/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*172/x*0.35805183739485175)^0.05)=4.7843137254902/x
    2/3*((1-1/0.03)+(3/4+1/0.03)*(1/3*172/x*0.35805183739485175)^0.03)=4.7843137254902/x
    2/3*((1-1/0.01)+(3/4+1/0.01)*(1/3*172/x*0.35805183739485175)^0.01)=4.7843137254902/x
    2x^2-4x-1=0
    1/x+1/(x+0.5)=1/(x-1)
    x*27.8/(6.42)=2
    3.14/(x*sqrt(1-0.628^2))=0.75
    3.14/(x(1-0.628^2))=0.75
    3.14/(x(1-sqrt(0.628)))=0.75
    2/3*((1-1/0.06)+(3/4+1/0.06)*(1/3*212/x*0.35805183739485175)^0.06)=6.343137255/x
    2/3*((1-1/0.13)+(3/4+1/0.13)*(1/3*212/x*0.35805183739485175)^0.13)=6.343137255/x
    2/3*((1-1/0.013)+(3/4+1/0.013)*(1/3*212/x*0.35805183739485175)^0.013)=6.343137255/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*212/x*0.35805183739485175)^0.07)=6.343137255/x

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