x/x-2≥-1
    500-400≥400×10％
    -2*a+8-4*a^2>0
    4.2x+8.4>=20
    m^2-6m＋8＞0
    a^2+4a>=8
    (x^2+2)/(sqrt(x^2+1))>=2
    15<=2-3a<16
    x+15/2>x-3
    17<=2-3x<=18
    16<=2-3x<=-14/3
    3x<2-x<=x+4
    2-x<=x+4
    69+10*x＞9000
    3x∧2-5x+2＞0
    -3/4x∧2+x+1＞0
    1/a<—1/2
    1/a<1/2
    -4082750+3000000+X-450000-X*2.5%≥300000
    0＜abs(x/(x+1))≤1

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