（650.24+80+21.90+0.01V+30.48+0.0002V）×0.06
    arctanx=π/sinx
    √2-X/㏑X
    √2-X/㏑X
    x＾2-64x+768=0
    X-1200=X*0.8-200
    x^2+x+1=0
    X(－0.2X+260)－200=36000
    x^4+8x^2-64x+68＝0
    X(-0.2X+260)－200=36000
    -x+e∧x=3.5
    (x-2)(x+1)(x+4)(x+7)=19
    x^4+10x^3+15x^2-50x-75=0
    x^4+12x^3+13x^2-54x-75=0
    x^3-5x^2-6x=0
    x=1
    x=2
    1.03X^2+1.84X^1.68=3×9.8
    0.28X^2+1.84X^1.68=3×9.8
    3.311*(x/(x+5100)-108/5208)=1.997

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