-3E+05ln(2295334)+1E+06
     -3E+05ln(x)+1E+06
    arccos0.921
    arccos0.866
    arctan0.921
    arctan0.921
    arctan(0.866)
    -1613.9375-((-1613.9375^2-30)/2*(-1613.9375))
    15.5-((15.5^2-30)/2*15.5)
    1-((1^2-30)/2*1)
    17.5-((17.5^2-30)/2*17.5)
    5-((5^2-30)/2*5)
    300000000➗3.6
    4x+2-10x-1=6
    -(3X-1)(2-x)(3X+4)
    （s+1)(s-2)(s+3)
    x-(x/200)*30 =11670.76
    P×120000-15000000-(165+250)×120000
    5/1－7i
    x(x+0.001)=8.3*10^-17

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