2/3-(5/6-3/4)÷3/8
    5/9:10/100
    39/100-1/5
    36/100+2/5
    9/10-4/15
    23/10+78/100
    7/2-23/100
    7/6-9/10
    （6/7）/(3/10)
    4/5+4/5
    4/5+105%
    b^2+（17/12）*b-1=0
    b^2+（17/12）*b-1<0
    (a-3)/(3a^2-6a)/(a+2-5/(a-2))
    7/10*1/4+1/4*3.3
    2/5*4÷2/15
    8÷2/5*10
    2/5÷8
    2/5/8*20
    2/5-1/3

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