52x^5-63x^22+75
    sin(x^x)/x^2-x^5+63-85x^11
    sin(x^x)/x^2-x^5+63-85x^11
    sin(x^x)/x^2-x^5+638
    sin(x^x)/x^2-x^5+63
    x^x=x^9-5*58x^7+4
    1.3x-x=150
    s＾2+5s+10=0
    x^2+1=3
    2t^2+15t+7=0
    0.0427 = 0.00213*（0.021*X^1.85+113）^0.5*X^0.84
    0.0166 = 0.00213*（0.021*X^1.85+113）^0.5*X^0.84
    0.002044=0.00213*（0.021*X^1.85+113）^0.5*X^0.84
    0.002044=0.00213*（0.021*X^1.85+113）^0.5*X^0.84
    x*1.45=4.07
    2x+3×15.2=56.5
    c(4,2)
    c(4,4)
    X^2+3 x=1.36
    (2/3)*x^2/(480)*9000000*(1-(0.3/x)^2)^(0.5)=2000

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