17-2x=7
    16+2m/7=18
    (6+n)50%=9
    11-2x=5
    1080*x=224
    -2x^2-8x-4=0
    3k/5+3/2=41/10
    -805790+229.826*（800+273.15）+8.314*（800+273.15）ln(([(100/x)-1]^11)*0.01^1 )= 0
    -805790+229.826*（800+273.15）+8.314*（800+273.15）ln(([(100/x)-1]^11)*0.1^1 )= 0
    -805790+229.826*（800+273.15）+8.314*（800+273.15）ln(([(100/x)-1]^11)*1^1 )= 0
    （0.5－0.01a）×（0.1－0.05a）=2a
    （0.5－0.01a）（0.1－0.05a）=2a
    -805790+229.826*（700+273.15）+8.314*（700+273.15）ln(([(100/x)-1]^11)*1^1 )= 0
    -805790+229.826*（700+273.15）+8.314*（700+273.15）ln(([(100/x)-1]^11)*0.1^1 )= 0
    -805790+229.826*（700+273.15）+8.314*（700+273.15）ln(([(100/x)-1]^11)*0.01^1 )= 0
    -805790+229.826*（900+273.15）+8.314*（900+273.15）ln(([(100/x)-1]^11)*0.01^1 )= 0
    -805790+229.826*（900+273.15）+8.314*（900+273.15）ln(([(100/x)-1]^11)*0.1^1 )= 0
    -805790+229.826*（900+273.15）+8.314*（900+273.15）ln(([(100/x)-1]^11)*1^1 )= 0
    1.312x^(2)+6.56x-6=0
    3a^(2)＋2500a－200=0

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