X*1/2X^3
    x=-2lg(3.32×10^-5+9.84×10^-8x)
    x^2+x-9=0
    X(x+1)=240
    7600/(x+112*0.12)+10000/(x+112*0.2)+10000/(x)=147.67
    7600/(x+112*0.12)+10000/(x+112*0.2)+10000/(x)=150
    x*2=200
    -50-x(100+x)*1% =10
    sqrt（x）
    X÷（X+6221200）=27.3%
    X÷（X+6221200）=27.27%
    -10lg(1-x)=10
    -10lg(1-x)=4.5
    X÷（X+5910200）=5%
    X÷（X+5000000）=5%
    2X+4=20+X
    X÷（X+5000000）=5%
    3X-X=20
    4= 3×x^3-4×x^2-4×x^1
    1000=950×x^4-50×x^3-50×x^2-50×x^1

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