1+2*x/x-1<3
    3-x/2x+5>0
    2-2x^2＞0
    2-2x^2＜0
     5x-3 { x }^{ 2 } -2 > 0
    2-2x＞0
    x+sqrtx<0
    x/(x+absx)>0
    1^x>2
    xln(-x^2)>e
    xln(-1)>e
    0^x>0
    x/0>3
    lnx+asinx+sqrt(-x)>-1000000000
    lnex<1000000
    2
    x>C(8,5)
    x>A(8,5)
    x>!(7)
    0.9*1263.15*10^6≤22.4*990*x*（820-0.5x）

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