Answers

2016-07-13T19:08:49+08:00
A12=53.....................
0
2016-07-13T19:12:30+08:00
[5+4(1)]+[5+4(2)]+[5+4(3)]+[5+4(4)]+[5+4(5)]+[5+4(6)]+[5+4(7)]+[5+4(8)]+[5+4(9)]+[5+4(10)]+[5+4(11)]+[5+4(12)]=
9+13+17+21+25+29+33+37+41+45+49+53=
372
0