(x-1)^2＞4
    32>2x x<18<2x
    x^2+2x-4>0
    x^2+2x-3>1
    4^x-2^(x+8)<8
    3600-600+2.5x-60000≥80000
    10*40*0.9-800*0.75+2.5x-60000≥80000
    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

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