9a × 3a
    （9x+3x）
    x^x=1/2
    x-1=x
    arctan0.0025x+arctan0.05x＝-90
    x^15-29x^7+22x^1.2-9等于0
    x^x^x^x=2
    arctan0.01x+arctan0.05x＝-90
    b=3822*1.2*0.75/15/100+0.4
    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

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