-2*（1-x^2）/(1-2)=4
    1/d+1/(d+25)+1/(d+100)=1/(d+38)
    sin(2x-2π÷3)
    1/d+1/(d+25)+1/(d+8)=1/(d+71.42)
    1/d+1/(d+25)+1/(d+8)=1/(d+71)
    X^2+(25/8-3/2x)^2=4
    4b^2-24b-36=6
    4b^2-24b-36
    x÷（40+x)=0
    x÷40+x=0.4
    700/(x+75)=700/x-3
    2x*x-3x-1=0
    arctanx-arctanx/2
    x^3-3x^2-9x-9=0
    (x+1)*（x+2）*（x+3）=2184
    8x²-18x+7=0
    x^3+6x^2+2037x+4057=0
    x^3-3x^2+2028x-2025=0
    7*(7/12x-13)-5*(5/12x+13)=20
    0.25a∧2+16＝2.25a∧2

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