№ 1 подробно
y=u^2; u=x^6+(3/x^4)-8 y`=2u*u` y`=2*(x^6+(3/x^4)-8)*(x^6+(3/x^4)-8)`= =2*(x^6+(3/x^4)-8)*((x^6)`+(3*x^(-4))`-(8)`)= =2*(x^6+(3/x^4)-8)*(6x^5+(3*(-4)x^(-4-1))-0)= =2*(x^6+(3/x^4)-8)*(6x^5-(12/x^5)).