2x^2-5x+2>0
    x^2-x-2<0
    sinx*sin7x<1/4
    3（x7/3）
    X>1-x/2
    2m+3>0
    2(x-1)<3(x+1)-2
    2(x-1)<3(x+1)=2
    (3x-1)/5≥(1-5x)/6
    (3x-1)/5≥(1-5x)6
    10x+20(50-x)>750
    60x+100(50-x)≤4200
    n+2<=242/(3n+3)<=n+4
    1400x-x^(2)-71648≥0
    x^(2)-4x+4≤0
    394.77＝x*0.894
    lna/1>a－1
    189770238939
    （1+x）÷1-x=10
    1314520

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