2.7^x-1≤x
    2.72^x-1≤x
    2.718^x-1≤x
    ex-1≤x
    sinx＜x＜tanx
    lgx＜-30
    lgx＜acosx
    lgx＜asinx
    (5000+x)/3<300*(3+(x/750))
    (5000+x)/3<250*(3+(x/750))
    x-absx≥0
    x^2-8x-1<0
    3x^2-2x+3<0
    3x^2+2x+1>0
    x^2+3x+2>1-2x+2x^2-3x
    10x^2-27x+18<0
    x∧-2/x∧2+1≥0
    1/x∧2/（x∧2+1）x∧2≥0
    （x∧2+1）x∧2≥0
    3a^2-2a+65>0

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