1、
(1/2a²+a-4)+(1/2a²+5a+4)
=a²+6a
=a(a+6)
2、
(1/2a²+a-4)+(1/2a²-a)
=a²-4
=(a+2)(a-2)
3、
(1/2a²+5a+4)+(1/2a²-a)
=a²+4a+4
=(a+2)²
1、
(1/2a²+a-4)+(1/2a²+5a+4)
=a²+6a
=a(a+6)
2、
(1/2a²+a-4)+(1/2a²-a)
=a²-4
=(a+2)(a-2)
3、
(1/2a²+5a+4)+(1/2a²-a)
=a²+4a+4
=(a+2)²