-2x+6≥4
    1 - !(26280) / ( 26280 ^ x ) / !( 26280 - x ) <0.005
    1-!(72)/(72^x)/!(72-x)<0.005
    （5a＋2）（－4a＋2）（－3a＋2）＜0
    －m^2－6m－10＞0
    －m^2－8m－6＞0
    4x^2-2>0
    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

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