（x^(2)-4x+1）÷x
    x^2+x+1=0
    x=1.9×0.723×138.22/200000×(1.9×65+0.08×40/0.0251)
    x=1.1-0.65×2.01/(0.0251×138.22)
    ((3-12*x)^2+(4-9*x)^2)/(1+9*x^2)^2-(16/5)^2
    x=(882.44×10^6)/(0.87×730×10052.8)
    b^(2)-6b+ 8=0
    nmslkun=1
    x^2-2x+0.7=0
    (NMSLKUN)=20172-(NMSLKUN)
    NMSLKUN=20172-NMSLKUN
    80-2x-4x=20
    4x减3加3x=6x减2
    3.234x+1825.29x^0.4=100000
    x^2-3x+1=0
    11.28x^3+40.94x^2-357.80x-3513.46=0
    4x减3加3x等于6x减2
    9((550-11x)/16)(2x+((550-11x)/16)-50)=25(50-x-((550-11x)/16))^2
    9((550-11x)/16)(2x+((550-11x)/16)-50)=25(50-x-(550-11x)/16)^2
    9((550-11x)/16)(2x+(550-11x)/16-50)=25(50-x-(550-11x)/16)^2

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