211.y=x³/√x=x^(5/2);⇒
y¹=5/2·x^(5/2 -1)=5/2·x^(3/2)=5/2·√x³;
212.y=2√x/x²=2·x^(1/2 -2)=2·x^(-3/2);⇒
y¹=2·(-3/2)·x^(-5/2)=-3/√x⁵;
213.y=6∛x/√x=6·x^(1/3-1/2)=6x^(-1/6);⇒
y¹=6·(-1/6)·x^(-1/6-1)=-x^(-7/6);
214.y=√x/x∛x=x^(1/2-4/3)=x^(-5/6);⇒
y¹=(-5/6)·x^(-5/6 -1)=(-5/6)·x^(-11/6);