2sinx=-1 0<=x<=2
    2x+5＞9
    12x+20＞50
    4^x＜3000/√3*16
    (x+454)*0.551<(x+510)*0.413
    (x+454)*0.551>(x+510)*0.413
    10b^2<3*√6
    2.5x+25000×2.5>2x+80000
    2*0.3583679495453/9.8+(2*x/9.8+4*0.3583679495453^2/9.8^2)^(1/2)+((2*x*9.8+4*0.3583679495453^2)^(1/2)-2*0.3583679495453)/9.8>=0.2
    1.05>=4*0.3583679495453*0.9335804264972/9.8+(2*h/9.8+4*0.3583679495453^2/9.8^2)^(1/2)*2*0.9335804264972
    x>=4*0.3583679495453*0.9335804264972/9.8+(2*1.15/9.8+4*0.3583679495453^2/9.8^2)^(1/2)*2*0.9335804264972
    x*0.3583679495453/9.8+(x*1.15/9.8+x^2*0.3583679495453^2/9.8^2)^(1/2)+((x*1.15*9.8+x^2*0.3583679495453^2)^(1/2)-x*0.3583679495453)/9.8>=0.1
    2*0.3583679495453/9.8+(2*x/9.8+4*0.3583679495453^2/9.8^2)^(1/2)+((2*x*9.8+4*0.3583679495453^2)^(1/2)-2*0.3583679495453)/9.8>=0.1
    3*（3x+1）>6
    3*（3x-1）>6
    2*(x+4)-3*(3x-1)>6
    3(1-y)>2(1-2y)
    16>5.2a+3
    x-3[x]<10
    x^2*(x-2)>=x^2

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