(x-2)/2-(x-1)<1
    x/2 >(x-1)/3
    x/2>(x-1)/2
    x/2>x-1/3
    10-4(x-3)<3(x-2)
    2(x+3)<3-x
    3+2x<-1
    1-2x>0
    20－10X－X^(2)
    3+3c<5c
    （1050×12-70%×60X×7.2%）÷（30%×60X+2%×60X） =3.8%
    2/30000*(x^2) -3*x + 30000 >= 0
    2*(x^2/30000) -3*x + 30000 >= 0
    2*(x^2/300000) -3*x + 300000 >= 0
    2*(x^2/300000) -3*x + 300000 <= 0
    300000 <= 3x-2*(x^2/300000)
    300000/x <= (3-2*(x/300000))
    x^2-2√2*x-1≥0
    b^(2)－12b≥-36
    b^(2)－12b＋36≥0

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