（x-3/2）（x-4）
    6x+4(135-2x)=440
    x^3+6*x^2+8*x+(16*sqrt(3))/9=0
    2/3*((1-1/0.03)+(3/4+1/0.03)*(1/3*172/x*0.35805183739485175)^0.03)=6.176470588/x
    5(X-1)+1/2=(X-1)+(2/9+3/2)
    5(X-1)=(X-1)+(2/9+3/2)
    2/3*((1-1/0.01)+(3/4+1/0.01)*(1/3*150/x*0.35805183739485175)^0.01)=4.784313725/x
    2/3*((1-1/0.2)+(3/4+1/0.2)*(1/3*150/x*0.35805183739485175)^0.2)=4.784313725/x
    2/3*((1-1/0.13)+(3/4+1/0.13)*(1/3*150/x*0.35805183739485175)^0.13)=4.784313725/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*150/x*0.35805183739485175)^0.07)=4.784313725/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*150/x*0.35805183739485175)^0.05)=4.784313725/x
    2/3*((1-1/0.03)+(3/4+1/0.03)*(1/3*150/x*0.35805183739485175)^0.03)=4.784313725/x
    3(X+4)=4(X+1)
    8X-3(X+50)=100
    5(X+24)=380
    tanx=1
    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

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