1000×5%×（1.10%）^n×50%/3＞200/2
    1000×5%×（1.10%）n×50%/3＞200/2
    120000＜-x²+700x
    (2900-a)+(4400-a/2)+(5000-a/4)+(5000-a/8)>8000
    (2900-a)+(3200-a/2)+(3500-a/4)+(3500-a/8)>9000
    7/2x²+7x>0
    0.055x+4>0.0565x
    0.056x+4>0.0565x
    0.0565x>0.056x+4
    5/x+3>1
    （x^2+9）^0.5+（（x-5）^2+25）^0.5＞
    -1/2x≥-3
    0.924-0.00013*y>0
    x>(25+0.075*x+0.2*5500+0.00013*x*5500)
    x>(25+0.075*x+0.2*5000+0.00013*x*5000)
    x>(25+0.075*x+0.2*6000+0.00013*x*6000)
    x>(25+0.075*x+0.2*4500+0.00013*x*4500)
    x>2*(25+0.075*x+0.2*2500+0.00013*x*2500)
    x>2*(25+0.075*x+0.2*3200+0.00013*x*3200)
    0.85-0.00026*y>0

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