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
    （x-0.905）*600-0.1=3
    1=-lnx-x
    xe^(x+1)=1
    x^2-52.3x+1=0
    30-（36-x）=
    (x-3)+(x+3)+(x/3)+(x×3)=128
    （x-0.443）*300-0.1=1
    3x^2-2x^3+12=0
    （38.584+x）×0.85＝38.584-x+63.968
    （38.584+x）×0.85＝38.584-x+64.968

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