2(x-1)≤10-4(x+7.5)
    9-3(x-2)≤0
    1-（3/4）（x-1）<0.5
    3x>12
    x-3>0
    x<5
    （1+a/4）4-1
    （1+a/4）^4-1
    （x＋5）≤7
    3（X）>12
    （x）-3>0
    3x+1≥0
    x*e^(x+1)>2
    2x-6<0 3x-15>0
    2x-6<0
    2x—2>4—x
    10x+15（80-x）≤900
    10x+15（60-x）≤900
    t^(2)-6t+1≤0
    40[120(1+a)}+46[80(1-0.375a)]<9050

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