3 g
3-1 + 3-2 =
3-3 + 3-4 =
3-5 + 3-6=

2g
+= 3-1
+= 3-2
2-5+ 2-63-3
2-7 + + 2-8 = 3-4
2-9+2-10= 3-5
2-11 +2-12- 3-6
2-13 =+ 2-14= 3-7
2-15 + 2-16 = 3-8

1g