2x-6>3
    [(208-x)/8]*[(637.5+x)/22.25]-22.25x>0
    x-19>0
    845.5-(3952-108x)/19>0
    3（x-2）<等于4x-5 5x-2/4<1+1/2x
    3（x-2）<等于4x-5 5x-2/4<1+1/2x
    3（x-2）<等于4x-5 5x-2/4<1+1/2x
    √(((1/4)x+√(48-15/16x^2))-x)^2+(3/4)x^2>8
    X- 5小于x/3-8
    abs((1.5x-2+sqrt(4-8.8x-0.55x^2))/1.4/x) >1
    abs((1.5x-2-sqrt(4-8.8x-0.55x^2))/1.4/x)>1
    (21+d)(21+4d)<(21+11d)
    (21+d)(21+4d)<(21+11d)
    70-a≤3a, 25a+15*(70-a)≤1245
    b+3>0
    (b-3)^2-4*9*1>0
    120a+4500-90a≤5500
    a＞100-a, a≤300-3a, 10a+1600-16a≤1170
    1/(x+6)<2/(x-4)
    1/(x+6)<2/(x-4)

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