Они совсем мне даются =(

y'+2xy=xe^(-x^2)

(1+x^2)y'-2xy=(1+x^2)^2


Найти о/р:

y'=(2y-x-5)/(2x-y+4)

(x^2y^2-1)y'+2xy^3=0

решщить уравнение Бернулли:

y'+y/(x+1)+y^2=0

помогите с решением хоть чгео нибудь,или на мысль наведите ....
совсем с ними не дружу(

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