x-1<3(x+1) ((1/3)x)-1<4-((4/3)x)
    （3÷2）x>3
    （2÷3）a>2
    （1÷2）a>2
    6/x<-1
    x/6<－1
    12a+10(10-a)<=105
    37500<=650m+400(75-m)<=38500
    80m+30(30-m)<=1700
    -9/x+3*ln（3/x）＞-6
    100＋14×（x－50）＜18x
    1.5-x>1 1.5-x<2
    150（0.9x-4）+120（x-5）≥420
    35x＋25（40－x）≤1100
    1.498*10^9<((6.35+0.01x)*(0.99x-6.35)^3)/x
    1.498<((6.35+0.01x)*(0.99x-6.35)^3)/x
    3-x-2x^2＞0
    2／x－3＜3／2x－5 ＋1
    0
    0

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