x+88/2>88
    44+77>6
    （12-x）x大于20
    220x+190(8-x)>=1565
    [4-x]/[x-1]>0
    [3x+9]/[x-1]＞7
    [2x+1]/[x-2]＞1
    x/[2x-1]＞1
    x(1-2x)≤0
    x(1-2x)≥0
    (2-x)(4+x)≥0
    (x+2)(x-1)≤(x-2)(2x+1)
    (x+2)(x-1)≥(x-2)(2x+1)
    (x+2)(x-3)≤6
    x²＜1
    x≦25+86x^2
    2.7^-0.1＞0
    2.7^x＞0
    e^x＞0
    e^m＞0

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