9 000 000
+
8 000 000
-------------------------
17 000 000
9000000
+
8000000
.................................
17000000
T nha
9000000+8000000=17000000 an vao dung cho to nhe
9000000
+
8000000
-------------------------
89000000
9000000
+
8000000
------------------
17000000
9 000 000
+
8 000 000
-----------------------
17 000 000
9 000 0000
+
8 000 000
------------------------
17 000 000
9000000
+
8000000
--------------
17000000