2+4x^2<0
    2+4x^2>0
    18x≤2000
    x÷3×600≥80000
    4*x^2-1≥0
    4*x^2-2≥0
    2*x^2-4x＞0
    5a^2－2a－20≥0
    5a^－2a－20≥0
    （ (1.8203125+0.244140625*(1-0.208^（x-2）)*4.752^-1)*0.625^x）/54>0.05
    (1.8203125+0.244140625*(1-0.208^（x-2）)*4.752^-1)*0.625^x>27
    X÷(X+7)≥0.6
    X÷（10+X）≥0.6
    xx-4x＞0
    2x+10>3x
    5/10×（50x+450-30x）≤255
    2xlnx+(（(x^2)-1）/x)-2x+2>0
    2xlnx+(（(x^2)-1）/x)-2x+2<0
    x^4-4x^3+3x^2＜0
    x^4-4x^3+3x^2>0

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