xln(x/4.024)=0.542
    -arctan（w）-arctan（w/5）-arctan（w/10）=0
    Xln(x/4.024)=0.0742
    xln(x/2.016)=0.7595
    0.742x=ln(x/4.024)
    1.4232=0.0184×X^2-0.0831X+1.4626
    1.4232=0.0184×X^2-0.0831X+1.4626
    1.4232=0.0184×X^2-0.0831X+1.4626
    1.4232=0.0184×X^2-0.0831X+1.4626
    1.4232=0.0184×X^2-0.0831X+1.4626
     0.06811x=ln(x/4.024)
    0.0068x=ln（x/4.012）
    1.432=0.0184X^2-0.0831X+1.4246
    1/（2∧x+1)
    x²+750²=(x+300)²
    2×2+x(4-x)=0
    （a^2+8*a+16）/36=64-64*a+16*a^2+（16*a^2+128a+256）/（4*a^2+4*a^3+a^4）
    0.01377=(-0.07226)*x^(-0.07499)+x^(-0.07499)+7-8(1-0.01079)*x^(-0.01895)
    lnx/2-x
    （x-29）（x-36）=18

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