(2/x^3)+(1/x^4)＜0
    (2/x)+(1/x^2)＜0
    2x^3+x^2＜0
    0.77x^2+1456.462x-2766.4＞0
    770x^2+1918x-2766＞0
    w/26+(540-w)/18<=25
    w/26+(540-w)/18<=25
    （1+x）x≤4046
    1000-10n＞1.645√n
    -4X>0
    (x+1)cosx>0
    5-(2x+1)<6x
    5-(2x+1)<6x
    -x≤2
    6<=2a^3-2a<=9
    168-x-x×10%/4×3≥30
    abs(x^(2)-(10000*x)+(800000))＞0
    (x-75)(x-30)>1600
    5(x-2)+12<6(x-1)+7
    3x-2>=-5

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