Помогитеее !! (подробно)

1562f(x)=x-1h→0f(x+h)-f(x)=lim[(x+h)-1-(x-1)]/h=lim(x+h-1-x+1)/h=limh/h=14f(x)=x²+2h→0lim[(x+h)²+2-(x²+2)]/h=lim(x²+2xh+h²+2-x²-2)/h=lim(2xh+h²)/h==lim(2x+h)=2x+0=2x6f(x)=2x³+xh→0lim[(x+h)³=(x+h)-(2x³+x)]/h=lim(2x³+6x²h+6xh²+h³-2x²-x)/h==lim(6x²h+6xh²+h³+h)/h=lim(6x²+6xh+h²+1)=6x²+6x*0+0+1=6x²+11582f(x)=-4xf`(x)=-44f(x)=-7x-8f`(x)=-7