3/5×(√3)/4[(4/9)^n-(4/9)^(n+1)]≤1×10^(-6)
    (4^X)+4^(x-1)>=2
    (9^(n))/(4^(n))>3 (sqrt(3))/(4)*10^(6)
    150-2x>90-x
    150-2x＞90-x
    x2-65x-900≤0
    45a+(50-a)*75<=3250
    -1.8x^2+60x+10000≥10260
    2x^2-75x-325≤0
    4/(2x-1)>2/3
    x<(x-0.15)(1-x+0.15)+2(x-0.15)^2
    x
    3x^2-4x-8<0
     x+144/x<22
    x+144/x<=22
    32222222222222222222222222222222222222222222222222222x<124325245423333333254+453454525x^2
    [8(1+X/100)*1440-10800]/10800>20%
    [8(1+X%/100)*1440-10800]/10800>20%
    sqrt(a^2)+abs（a）<4
    sqrt(a^2)+abs（a）<4

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