10lgX=-3
    10lgX=6
    (X+1)^3-6(X+1)-8=0
    4+x²=16+（8-x）²
    x+20÷3=80-x÷2
    x*(x-1)*(x^7-15*x^6+89*x^5-265*x^4+414*x^3-322*x^2+105*x-9)=0
    10(1-x^2/4)/x^3=-3.14/16
    3Y+Y/3=180
    3x^2+300x+5000=0
    x^3+x^2+30=0
    （x-5）（x+3）=6
    （X+3）（X+7）=5
    4x+4（224-2x）=500
    （5.42-5.42/1.13*0.13+0.13）/7.01=X
    （6.4-6.4/1.13*0.13+0.15）/7.01=X
    x=78100+1.33%x
    x=77900+1.33%x
    (1950-3400)/(x-200)=(0-1950)/(60-x)
    4123.87=105876*(X+1)/2*28.5*1%
    （1.25x+1.2（300-x））*0.8=296

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