（2.126+3.388）/2/0.881=0.059*x+3.388-sqrt（（0.059*43.26）^2-4*x*0.059*0.881*3.388）
    8x-3x+2<6+x+8
    x*x*x+10*x+20=0
    x^3-x+1/2=0
    0.01x^6+1.01x^4+x^2-1=0
    1.0×1.3×0.801
    -5xxx+1.5xx+4x+1=0
    5xxx+1.5xx+4x+1=0
    9%-8%/9%-i = 5.6044-4.6610/5.6044-i
    x^2-1412.774x-1995930.325=0
    x^2+1412.774x-1995930.325=0
    -0.8X+125549.4=4790622666
    -0.8X+125549.4=4790622666/X
    -0.8X
    x ^(3)-3x +2＝0
    6x+8>3x+8
    16乘0. 5+6x=10x
    200*x^3-4000*x^2+20000*x+0.01=0
    200*x^3-4000*x^2+20000*x+100=0
    x^3+10*x+20

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