2/(4-4/3)<7/9
    2^x/((2^x-4/3)(2^x-2/3))>2^x/(2^x-1)^2
    500X+550（6-X）<=3100
    e^x+2x-1>0
    cosx+sinx+1>0
    (n+7)*2^(n-2)>2022
    -1200-800/(1+x)+600/(1+x)^2+370*[(1+x)^4-1]/[x*(1+x)^6]+550/(1+x)^7>0
    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

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