lnx/x^3＜0
    lnx/x^3＞0
    70x+35(80-x)<=4200
    150z+100(12-z)≥1500 5000z+3000(12-z)＜54000
    4X≥-12
    -（1/3）X<2/3
    6X≤5X-7
    6X≤5X-7
    2x+10>3x
    (3y-1)＾2-4y(3y-1)≥0
    (x+1)/(x-1)>-x
    (2x+1)/(x-3)<1
    xxx+8x-9>0
    x3+8x-9>0
    -12*m*m-32*m+64>0
    （2m-8)*(2m-8)-16m*m>0
    45÷x^2>2
    23÷x>1
    45÷x^2>2
    45÷x^2≥2

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