x^2+8x-1=0
    x^2+(2+√5)+1.5-√5
    2X+5X（30-X）＝90
    210=150+330×150^2/(330^2+x^2)
    10000=150+330×150^2/(330^2+x^2)
    500=150+330×150^2/(330^2+x^2)
    1/480+1/x=1/150
    150=150+330×150^2/(330^2+x^2)
    X+0.1X=0.1
    190=150+210×150^2/(210^2+x^2)
    310=150+330×150^2/(330^2+x^2)
    0.1685=x×150/(330^2+(3.14×x^2/0.000632)^2)^0.5
    x/(1-x)=10%
    3q^2-40q+200
    3q^2-20q+200
    15x(40÷2-x)=1560
    15x(40÷2-x)=1500
    6x+6(52-2x)+10[37-x-(52-2x)]=250
    √x2-x
    4.6(50+a)=(10-4.6)(50-a)

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