3/2
4/9
9/4
2/3
(a + 1)(a + 1)
(a + 1)(a2 + a + 1)
(a - 1)(a2 - a + 1)
(a + 1)(a2 - a + 1)
(a + b)(a + b)(a + b)
(a + b)(a2 + b2)
(a - b)(a + b)(a2 + b2)
(a + b)(a2 - ab + b2)
x2 + x + 1
x2 - x + 1
x2 + 1
x + 1
2
3
1
4
(x+4)(x+3)
(x-4)(x-3)
(x-4)(x+3)
(x+4)(x-3)
1/2
- 1/2
1/4
- 1/4
69
99
89
109
12ab
24ab
36ab
144ab
x2 + y2
x2 - y2
x + y
x + y2