5x－8<8＋x
    3x－5>x＋3
    2x／(x+1)≥3
    log(2,x)<2
    4x+28-5(x-1) <4
    (410940000÷502654.82÷400)≤2×14.3×sin(3.14a)×sin(3.14a)×sin(3.14a)÷3÷3.14+14.3×a{1-sin(2×3.14a)÷(2×3.14a)}×{sin(3.14a)+sin(1.25×3.14-2a×3.14)÷(1.25-3a)÷3.14
    (410940000÷502654.82÷400)≤2×14.3×sin(3.14a)×sin(3.14a)×sin(3.14a)÷3÷3.14+14.3×a{1-sin(2×3.14a)÷(2×3.14a)}×{sin(3.14a)+sin(1.25×3.14-2a×3.14)÷(1.25-2a400÷0.25
    (408590000÷14.3÷400÷400÷400)≤2×sin(3.14a)÷3+a{1-sin(2×3.14a)÷(2×3.14a)}×350×1÷400÷0.25
    240/(50+x)≤3
    (300-60)÷(300÷60+x)≤6-1-2
    410940000÷(14.3×400×400×400)≤2×sin(3.14a)÷3+a{1-sin(2×3.14a)÷(2×3.14a)}×350×1÷400÷0.25
    383880000÷(14.3×500×500×500)≤2×sin(3.14a)÷3+a{1-sin(2×3.14a)÷(2×3.14a)}×465×1÷500÷0.25
    40[90(1+a%)]+32[80(1-0.4a%)]≤6804
    3600*40a%-12.8a%*2560≤644
    3.45m≤10
    x÷60+x*0.0045=1764
    x/60+x*0.45%=1764
    x/60+x*0.45%
    4
    1/-2a<1

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