0.73x+0.65(50－x)＝34.1
    13.13c=（3.4+c）×7.93
    13.13c=（3.4+c）×7.92
    13.13c=（3.3+c）×7.93
    13.13c=（3.3+c）×7.92
    2（x-13）=x+6+6
    2（x-13）=x+12+13
    x^2+x-1=0
    x=1-2.10%
    lg40.8-lg59.2=7.967-1668.2/(228+x)-7.879+1473/(230+x)
    lg40.8-lg59.2=7.967-1668.2/(228+x)-7.879-1473/(230+x)
    2/3*((1-1/0.2)+(3/4+1/0.2)*(1/3*172/x*0.35805183739485175)^0.2)=6.176470588/x
    2/3*((1-1/0.13)+(3/4+1/0.13)*(1/3*172/x*0.35805183739485175)^0.13)=6.176470588/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*172/x*0.35805183739485175)^0.07)=6.176470588/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*172/x*0.35805183739485175)^0.05)=6.176470588/x
    s^3+2s^2+7s+4＝0
    30=（6/11）X
    30X=（6/11）
    X=30÷（6/11）
    12X=0.25

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