x+7≥98
    (H*0.003)÷(H*0.0536+1300)>3.5%
    (H*0.003)÷(H*0.00536+1300)>3.5%
    (H*0.3%)÷(H*5.36%+1300)>3.5%
    (H*0.003)/(H*0.0536+1300)>3.5%
    (H*0.03)/(H*0.0536+1000)>3.5%
    (x*0.3%)/(x*5.36%+1000)>3.5%
    (H*0.3%)/(H*5.36%+1000)>3.5%
    2x-1>0
    (2x-3)(x+1)<0
    (2x-3)(x-1)<0
    3A*A+16A+20≥0
    (2.5x)*(2.5x)+(1.82x)*(1.82x)>=8.09*8.09 2.5*2.62=a 1.82*2.62=b
    ((a/430)^2-1)*(430-a)*2*0.01>0.02
    ((a/430)^2-1)*(430-a)*4.07*0.001>4.07*0.001
    (500x+300)×1.616＞[500(x+0.466)+300]×1.15
    (600x+300)×1.616＞[600(x+0.466)+300]×1.15
    (600x+400)×2.616＞[600(x+0.466)+400]×2.15
    (800x+300)×2.616＞[800(x+0.466)+300]×2.15
    (600x+300)×2.616＞[600(x+0.466)+300]×2.15

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