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
    2x－1／3≤1－x＋1／2
    e^（x+lnx）≥x+lnx+1
    1<2
    （x+1）（x+5）（x+2）（2x+2）<0
    -6＜x＜8
    （x-2×x+x-2×x+x×x）＜48 x+2×x+2×6＞48
    （x-2×x+x-2×x+x×x）＜48
    x+2×x+2×6＞48
    sqrt(4+24a)<-2-4a
    sqrt(4+24a)>4a-2
    cosx/(sinx)^(1/2)+2(sinx)^(3/2)/cosx>=2

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