512*（1-x^10）/（1-x）＝1025
    32*（1-x^10）/（1-x）＝1025
    16*（1-x^10）/（1-x）＝1025
    πx+1
    4x+3(2x-3)=12-(x+4)
    (1/4-4/9)x(-6)^2+7/(-1/2)
    3x-4(x+1)=6-2(2x-5)
    (10+x)(5000-100x)=8000
    (1+0.1x)(500-10x)=800
    20*(26-x)=45x
    -600*（T/600-298.15/100)=2.5(T-298.15)
    2x=1
    0=3.5*8.314*ln(T/298.15)+8.314*ln(1/6)
    1.01^x/0.99^x=100
     0 = 3.5*8.314*ln(T/298.15)+8.314*ln(1/6)
     0 = 3.5*8.314*ln(x/298.15)+8.314*ln(6)
    0=3.5*8.314*ln(T/298.15)+8.314*ln(6)
    0=3.5*8.314*ln(x/298.15)-8.314*ln(6)
    0=3.5*8.314*ln(T/298.15)-8.314*ln(6)
    0=2.5*8.314*ln(T/298.15)-8.314*ln(6)

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