400000/[500*（1+25%）]/x<50
    400000/300/x/0.8<50
    400000/300/x<50
    （x+3）∧4-4x（3x-18）
    4x-(x-1)^2≤0
    250000*0.3^x<1-0.3^(x+1)
    250000*0.75^x=1-0.75^(x+1)
    250000*0.75^x<1-0.75^(x+1)
    5x+1=3
    5x－8<8＋x 3x－5>x＋3
    5x－8<8＋x 3x－5>x＋3
    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

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