150+100（10-x）≤1250
    （3x²+2x+1）/（x²+x+2）<=1
    （x+1）/（2-x）>=-2
    x/（x-1）>0
    3x加8减5（x减1）大于等于0
    xlnx+e(-x)>0
    x^2-4x-3＞0
    (-2)<(-1/m)<(3/2)
    12x减48小于4x减32
    x减4小于（x减8）除3
    4x加4小于等于7x加13
    2x减2大于等于3x减6加6
    （x-1）*(x+3)≤0
    0.1x+0.01x＜12
    2X>3X
    a²＞1
    32≥4t+t^2
    t^2+4t-32≤0
    t^2+4t-32≥0
    4/3y≦70≦3/2y

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