x^5+2x^4+3x^3+6x^2-4x-8=0
    2x+3x+4x=45000
    2x+3x+4x=4500
    X-25/4=0.25*X
    1=x/4
    0=1/3（x-1）²+2/3
    32x^4-20x^3+16x^2-5x+2=0
    x*0.45+x*0.45=60
    8x^3-80x^2-5=0
    x×ln（（1.8-x）/（3.82-x））=10.02
    x=1
    x/(1+x)=x-0.01
    x/(1+x)=x-0.1
    sinx=-（sqrt2）/2
    -0.8 ^n=2
    x^3+6x^2+304x+200=0
    (x-x/1.13*0.13)/7.27=0.079
    （x-393）除x=-0.17
    (x-x/1.13*0.13)/7.27=0.076
    x/2.4+x=5.1

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