50-4*[(1+x)^4-1]/[x*(1+x)^4]>45/(1+x)^4
    1>2
    （7*x-6）/2*x+3>2
    sinxcosx+sin2xcosx+x≥1.96
    sinxcosx+sin2xcosx+x≤1.96
    2x<100-3x<3x
    (1+x)/2-(3x-1)/4<=1
    3*(x-1)<2*(1-x)
    x>3 x<4
    m-1<0 4m+6>0
    x+1>=4
    2x+9>-6x+1
    (3x-4)/6<=(2x-1)/3
    3x-5
    3x-6<=9
    1-(2x+5)/3>x-2
    5x+2>=3(x-1)
    x/3<(x+1)/4
    2(x+2)<=x+3
    2(x+2)<=x+3

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