6/(m+5)>2
    3+(2/t)>(8/t)
    －5＜2x－3
    2^x>x^2+3x-3
    -（x^2）-5x+6≥0
    2200*(0.98)^m<=1100
    3*x^3+5*x^2+7*x+11>0
    x^2+2x+1>x^2
    e^x*sinx
    x+ln(1-x/2)>0
    2X1+5X2≤1200 4X1+2X2≤800
    4X1+2X2≤800
    2X1+5X2≤1200
    1/2x>-2
    T<3
    10*x+15*(45-x)<=560 20*x+15*(45-x)>=548
    x∧2-1＞x
    x∧2-1＞x
    x∧3-1＞x
    x-1＞x

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