(y+4)²=(y+4)(y+4)
(9+a)²=(9+a)(9+a)
(5a+1)²=(5a+1)(5a+1)
(20+4c)²=(10+4c)(10+4с)
(5a+6b)²=(5a+6b)(5a+6b)
(a²+b²)²=(a²+b²)(a²+b²)
(y+4)²=(y+4)(y+4)
(9+a)²=(9+a)(9+a)
(5a+1)²=(5a+1)(5a+1)
(20+4c)²=(10+4c)(10+4с)
(5a+6b)²=(5a+6b)(5a+6b)
(a²+b²)²=(a²+b²)(a²+b²)