次の計算をしなさい。
 
(r3+2)(r3+3)
9+5r3
(r3-2)(r3-3)
9-5r3
(r3+r2)^2
5+2r6
(r2-r5)^2
7-2r10
(r3+2)^2
7+4r3
(r2-4)^2
18-8r2
(r5+2)(r5-2)
1
(r5+r3)(r5-r3)
2