x^2-6x+5<0
    5x-1＜3(x+1) (2x-1)/3-(5x+1)/2≤1
    1.5k^(7/4)≥k^2-k
    100x+150*(30-x)≥3900 100x+150*(30-x)≤4000
    (x-1)/7<(2x+5)/3
    2x+1≥5
    (2-x)(x+1)>0
    x²-3x<0
    (x-1)(2x+1)≤0
    2-x>1
    2x-1>0
    2-x>0
    2x-1>0
    2x>1
    (2/3)x^2≤0.5x^2+0.75x(7/4)-3.5x-(5/4)
    (2/3)x^2≥0.5x^2+0.75x(7/4)-3.5x-(5/4)
    x^2≥0.75x(7/4)-3.5x-(5/4)
    0.5x^2≥0.75x(7/4)-3.5x-(5/4)
    0.5x^2+（3/4）x^(7/4)-(3/2)x-(5/4)
    3x^（7/4）≥x^2-x＋5=

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