0<1-2a<1
    X-1/2≤10-5/2 x
    (3x-1)/2<=x+1
    a-3>2sqrt(2)
    2x+3<-1
    x-2(x-1)<3
    45(100-x)+38x<=4200
    2(x-0.25)^2＞3.125
    -1/2
    -1/2<4/a
    -1/2
    [sqrt(x+1)*(2x-1)*(2x-1)*(3x-5)]/(x+2)>x+5
    [(x+1)*(2x-1)*(2x-1)*(3x-5)]/(x+2)>0
    4*2+3*4+2*（x-2-4）≥2*18
    -15000+X-X*8%/4≥4500
    2x-3<9-x
    175（30-z）+80z≤2600
    3x²-7x-6<0
    168-X-X*10%/4*3≥30
    x+1>2＾x

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