6) =(x^1/6)²-(y^1/6)² / x^1/3 (x^1/6+y^1/6)=(x^1/6-y^1/6)(x^1/6+y^1/6) /
/ x^1/3(x^1/6+y^1/6)= x^1/6-y^1/6 /x^1/3 ответ4
7) 5/ (k^1/2-2) -5k^1/2/(k^1/2)(k^1/2)= (5*(k^1/2+2)-5k^1/2) /k-4=
= (5k^1/2+10-5k^1/2) /k-4 =10/ k-4 при k=3. 10/3-4=-10
ответ 2
8)(k^1/4+l^1/4)(k^1/8+l^1/8)(k^!/8-l^1/8)=(k^1/4+l^1/4)((k^1/8)²-(l^1/8)²)=
= (k^1/4+l^1/4)(k^1/4-l^1/4)=(k^1/4)²-(l^1/4)²=k^1/2-l^1/2
ответ1