（x-1）/7＜（2x+5）/3
    ex＜x
    11x>=619
    4.5x+1.2x+2x+3.3x>=699
    4x>=599
    11.5x>=799
    t + 23 < 123
    5x+3.2x+10x+8.3x>=799
    0.15x>1496
    1679+1.55x<=108+1.7x
    (1-x)(x+2)>0
    (x-1)(x+2)>0
    5.7+14.2lnx>38
    x（10-x）大于6
    6x^2+9x+1＞0
    6x^2+9x+2 ＞ 0
    3x>4x-6
    x-1≤9+6x
    -x^2-2x+3<0
    （25-4）x+80%*40(50-x)<=1500

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