T=1+（39763/30+3822/30）/{0.9[8190/60+3200/60*6]}
    T=1+（39763/30+3822/30）/{0.9[8190/60+3200/60*5]}
    T=1+（39763/30+3822）/{0.9[8190/60+3200/60*5]}
    x×（1-0.5x）＝0.2494
    T=1+（39763/30+3822+3734）/{0.9[8190/60+3200/60*5]}
    x^4+4x^2+5=0
    6 x+3=7 x-4
    X-10/10-0.1=1.1x-12/12
    10000/x+10000/x^2=15000
    5000+5000/x-8000/x^2=0
    8000/x+7000/x^2=10000
    0.8x＝x-80
    （4-t）^2+（28/3-4t/3-4）^2=（t-7）^2+（t-28/3+4t/3）^2
    2400/x=（2400/（x-20））-10
    2x=4
    50*sin(x)/sin(36)=20/sin(x+36)
    83.04＋0.4x=160
    83.04＋x=155
    （346/2.5）×0.6＋0.4x=155
    1/（x+1.25）=2/x+1/（x+2.5）+1/（x+5）

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