log(-1/3(x^3))
    x(70-2x+2)=650
    20000÷x=0.00545
    1÷x=2
    1×x=2
    x*x=4*x*x+10000+90000-1200x
    xcosx
    x*x=10000+90000+4*x*x-600x
    X^(2)/16+x-100=0
    x^(3)/6400+x^(2)*26/400+x = 100
    x^3/6400+x^2*26/400+x=100
    x2=1
    6/7*（2x-1/3)=2
    （x-40)(50000-500x)=350000
    2^x＋x＝5
    x^3-x-1=0
    （(4266.97-X-6139.93)/6139.93)*0.5=((1741.35+X)-3716)/3716
    （(4266.97-X-6139.93)/6139.93)*0.5=((1735.99+X)-3716)/3716
    1.1x+x=105
    （(4266.97-X-6139.93)/6139.93)*0.5=((1735.99+X)-3716.13)/3716.13

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