-1/2a>1
    (x-10) (x+20) > 0
    4225a^(2)-39000a+90000 > 4478625
    285(x-276)<300(x-285)
    10000cosx<4624(1-sinx)
    (x+4)/3>2x-1
    3x-1≥2(x-1)
    (x-1)/(x-2)>1/2
    2592xx+34810x-522150<0
    abs x-15>=56+abs2x-3
    abs x-7>=56
    x-7>=37
    2(2x-1)-(5x-1)≥1
    x÷30+x÷20=20
    0.818-0.182k<1
    1+1.818-0.2002k+0.818-0.182k>0
    1+1.818-0.2002+0.818-0.182k>0
    570=0.3b+b
    x/2+1≥x-3 x/3-1>0
    x-3（x-2）≥4 2x-1/5

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