10.8%=0.8×（1+g ）/10+g
    3.14/(x*sqrt(1-0.34^2))=1
    e^(-3.14*x/sqrt(1-x^2))=0.3/0.95
    90-arctanx-arctan0.25x=51
    90+arctanx+arctan0.25x=51
    5*sqrt(0.81x^2+1)/(x*sqrt(1+x^2)*sqrt((0.25x)^2+1)*sqrt((0.1x)^2+1))=1
    5/(x*sqrt(1+x^2)*sqrt((0.25x)^2+1))=1/(sqrt(9.05))
    ex-e2：x=0
    5/(x*sqrt(1+x^2)*sqrt((0.25x)^2+1))=1
    3.055=（（0.021*x^1.85+955）^0.5）*x^0.84
    566=（（0.021*x^1.85+955）^0.5）*x^0.84
    x*(x+5)=300
    100=300X−2800000-160X
    1/(2*x*sqrt(1-x*x))=10^(8/20)
    (x-1)-(2x-1)=1x-3x
    2(y+2)-3(4y-1)=9(1-y)
    2(y+2)-3(4y-1)=9(1-y)
    2(y+2)-3(4y-1)=9(1-y)
    3(x-2)-2(4x-1)=11
    （5-t)t=24

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