（0.6-x）(0.5-x)/(0.2+x)
    （0.6-x）(0.5-x)/(0.2+x)
    x^2+2(x+2)+18=22218
    （2.405/R）^2＋(3.1415/2.4/R)^2=8.6
    2x＝1
    lnx=2.24
    x*（x+1）*（x+64）=6400
    0.7*x^(1/1.13)=20-x
    0.7*x^0.88=20-x
    (x+1)*2.71828^x=0.1
    (70−2x)×20%+(x+30)×18%+x×16%=100×18.2%
    (70−2x)×20%+(x+30)×18%+x×16=100×18.2%
    9-（4-x)=2
    3*x^3+x+2=0
    7 - 2n = 8n - (-4n)
    4 - 2y = 7y + 13
    5x - 17 = -x + 7
    (1/2)*(16 - 8y)
    2*(x -1) = 14
    30 + (0.0825 x 30) + (15% x 30)

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