（x1+x2）（x3+x4）（x5+x6）
    7*10^7=1*10^3*10*7*200*x-(200*14*x)*2.5^3
    7*10^7=1*10^3*10*7*200*x
    （838613-X）/X＝0.555
    ln(x)/e^x
    3.7*10^8+(200*14*x)*2.5^3=1*10^3*10*7*200(50+x)
    x+1=0
    2x-x^2
    84.1 = 32.45ln(x) - 6.2286
    50 = 32.45ln(x) - 6.2286
    x+2=4
    5x—2=7x+8
    5x-2=7x+8
    3/4y-1-1=5/6y-7
    x-0.07/x-0.09=2.79
     20%-15%-((1+x)/x)×10%×40%=0
    X*0.03=X-3793.20
    X*0.03=X-4321
    0.94 = （0.021*x^1.85+210.125）^0.5*x^0.84
     0.94 = （0.021*L^1.85+210.125）^0.5*L^0.84

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