x^-49>0
    -27m^(2)+54m+225<0>
    （22.5-15-m）/15>0.1
    15/（22.5-m）<0.1
    15/（22.5-m）>0.1
    x+(1-x)/2>(3x-2)/4+1
    (1-x)/3<(1-2x)/7
    (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

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