x-5<-3
    arcsin(2/45)
    a^3+1-2a=0
    arcsin(4/45)
    ((4-y)^2+y^2/4)*(16-4+2y-5y^2/16)=16*(4-y)^2
    1× (1+i/4)^24＝ 2
    2x+5>3（x+1）
    arcsin(4/9)
    (x+4)^2-x^2=112
    x^5-2x^4+x^3=9/4
    log(10,40/(x*sqrt(1+0.04*x^2)*sqrt(1+0.005^2*x^2)))=-3/20
    x+4<4x-1
    x^3+3x^2-3x+1=0
    x^2+14x-955=0
    （x+4）^2-x^2=112
    （x+4）^2+x^2=112
    1.8*100000000=1644500x-17875x*x
    1.8*100000000=1644500x-17875x^2
    1.8*100000000=1.0*14.3*250x*（460-（x/2））
    (13x-x^2)/(x+1)*(x+(13-x)/(x+1)=42

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