4x^2+7x-36>0
    （x+310)*2*0.63+（x+310)*0.37>（x+650)*2*0.33+（x+650)*0.67
    5x-2<=3x+1
    x/3+1<3x-7
    4x-4<3(x-1)
    1≥1÷x≥－1
    1≥1% x≥－1
    1-（0.8）^n>0.9
    1-（0.2）^n>0.9
    100m^2-50m+2≦0
    -7x>7
    x²-20x 95<0
    －x^2+5x－2＜2
    9x>10>8x
    9x>10>8.9x
    9x>10>7x
    2/3x-3/2>4/5
    3x>2
    7≤-2X+9＜13
    7≤2X+9＜13

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