x^2>9
    x+1>1
    （x+1）（x^2+1）大于等于0
    (2x-1)/3-(5x+1)/2<=1
    x-(5-x)/3<=(x-1)/2
    x*2510.266 > (x+6.1)*2018
    (x+4)*2510.266 > (x+9.1)*2018
    lnx<3
    3y ≤ -2
    4x>=-1
    4x<=-1
    60a+100(10-a)≥650
    100a+150(10-a)≤1200
    x＾2+5x-6/x-1≥0
    (x-1)＾2(x+6)≥0
    (x-1)＾2≥0
    x+3(x-2)>4
    x>1/2(80-x)
    (x^2+3*x+2)/(x-1)
    4x－2≤3－3x

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